That sounds very expensive and impractical.
The cost comes down to what is expended to defeat the targets.
If you are launching 10 million dollar Patriots at each drone then that is expensive and impractical... first of all the cost of equipping all your forces with Patriot batteries and also the cost of launching missiles at targets just make it silly.
With a 23mm or 30mm calibre round with air burst capacity you could find your targets and determine range and fire a burst of 3-4 shells per barrel and set them to explode at or around the distance to the target, which should create a mass of splinters and fragments all around the location of the target drone giving a very very high chance of getting multiple hits with a very small number of shots fired.
In comparison with normal rounds you might need to fire thousands of rounds just to hit one tiny drone at distances over 1km so despite being more expensive than standard rounds the extra cost is well worth it.
You could also use such airburst shells against troops in a trench or behind cover but without top cover, and you can carry belts of other ammo types for other threats or targets like anti armour.
(Has been shown in combat where overhead drones film enemy forces in trenches or in the open used to spot vehicles or weapons to walk their target on target and take out enemy forces you can't see with a direct line of sight, yet you effectively wipe them out or stop their attacks with accurate fire using a drone as a spotter).
These vehicles can be dual purpose systems useful for other jobs that can be used in other roles too... the optics and radar might enable enemy troops to be detected and engaged at greater distances too.
Fitting the 23mm gun turret to a vehicle like the Kurganets you could have the crew in the hull in the front (3) and then the turret with two 23mm guns with maybe 3,000 rounds of ready to fire ammo, and then have the entire troop compartment at the rear with perhaps 40 to 50 of these mini self defence missiles arranged vertically in a vertical launch system ready to defend from artillery or enemy airpower or ATGMs.
You could fit extra missile tubes to other vehicles or have dedicated vehicles filled with hundreds of missiles ready to launch... produced in enormous numbers the price might come down to something that is affordable to deploy widely... look at how many ATGMs they produce.
The first laser beam riding ATGMs were the gun tube launched missiles and they were expensive... $50K plus each, but now Kornet, which is a 152mm calibre laser beam riding missile has an export price of under $5k per missile... very affordable.
During WWII someone might say equipping every soldier with a bullet resistant vest that will stop .338 Lapua ammo would not be affordable, or tracked vehicle transport for every soldier so no one has to walk or be moved by truck would be too expensive too... but the reality of drones makes it something to try to achieve.
Obviously even when this system is up and running the losses of Russian forces is not going to go to zero, but these things are not impossible.
An integrated air defense package like Tor-M2 that can detect, track and engage targets all on its own is very expensive. They are also not designed to work solo - to be effective they need to be part of a battery with a single unified command and control and served by various combat and non-combat support.
The TOR is expensive, not because it has super expensive ARH missiles, but because it has high tech 3D search and tracking radars that were and are very capable high performance systems. The missiles are relatively cheap command guided missiles.
This new system is likely to shift precision requirements to the missile so the missiles wont be so cheap, though as I have said having ARH and IIR and also command guided missile alternatives could reduce the price while making the system more flexible because not all targets have a radar signature or IR signature that makes engagement possible with sensors small enough to fit in the nose of a tiny missile, so command guided missiles do make sense, but a mix is certainly worth while.
As AESA radar elements go into enormous mass production their cost per element will drop to a few dollars each making radar arrays much more affordable and over time mass production with refine and improve performance as well as reduce costs.
If you take them piecemeal so that most of your army has an AD coverage you're doing it wrong. Your AD vehicles will get attrited very quickly without much impact.
With the modern fire control systems and optics of BMPs and BTRs and airburst cannon shells of calibres of 23mm and 30mm and 57mm and 125mm the load can be distributed to most armoured vehicles fairly cheaply and easily... airburst rounds are useful for engaging a range of targets on the ground and in the air.
this system should be a cheap solution to drones.
The use of 23mm cannon on ground targets suggests that they would be useful for all sorts of things...