How do you want to kite with it? Conscripts have cheap-to-tech-and-use AT grenades which disable engine and guards reliably hit it even on long range with their AT rifles. On top of that it deals very low damage on long range.
I think we mnight be using the scout cars differently then.
There is no way you can avoid taking damage with the SC. Don't ask for a safe no-damage solution.
What you should do is kite at the max range and then pull the SC away for repair when it nears half health. And of course you have to monitor the animation of the target infantry. As soon as something looks like the beginning of an AT-toss, back off. DOn't use move order - it takes too long. Use reverse.
Repair is free in terms of MP, which is so important in the early game.
There are only 2 units that the scout car counters: Penals and Shocktroopers. However, even they'll deal reasonable damage to it.
You are thinking of a 'hard counter', but the SC is only a soft counter to anything. And there's nothing wrong with that. Who says every unit has to be a hard counter to something?
Problems the SC has:
1) it's t2, so it's arriving too late to have an impact
2) t2 also offers halftracks, which are superior while costing only marginally more
3) 20mm upgrade is overpriced
4) soviet AT infantry is too effective against it
5) it's damageable by small arms
There's not much you can do apart from either moving it in t1 or buffing it's health/armour massively while making it more expensive.
@1) No problem since getting to T2 is so easy. Disagree that it is only usefull for a short while.
@2) Not sure what you mean. The FHT costs a boatload of ammo. Saving for that might take too long.
@3) You might have a point here
@4) Soviets have rather few early AT-options. I wouldn't change the AT-nade just because of a scoutcar.
@5) Yes. It's nothing but a car with sme extra plating. It's not a tank.
I still don't see a major problem. The SCs are usefull enough for their costs IMO.
Anyway all this remains me of a little known option: shock nades will also damage or kill SC and HT if you time it right. And ofc so do satchels. It's rather rare to pull that stunt off, but bulky vehicle pathing sometimes makes it an option.