How to counter an early Schwerer Panzer HQ?

Like the title says, how do you destroy an Schwerer Panzer HQ that set up in a central location?

Just going for armor doesn't seem to work because OKW AT like Volks and Raketenwerfers can support the flak gun but Soviet infantry can't deal with them because of the flak gun suppressing them.

Nor do indirect fire options work fast enough to destroy the HQ in time.

Mortars work surprisingly fine against Schwerer Panzer.

Another option are two T34 supported by some kind of arty (like fire arty)to clean the place from Raketenwerfers and such. Be careful to always face your frontal armor to the Schwerer Panzer.

Usually I do both.
T34s make a first attack, then retreat to repair them while mortering the truck to avoid it being repaired, and finally another attack with double T34 to definitely destroy it.

Also keep in mind that if they go for an early Schwerer Panzer HQ then they either skipped Battlegroup Headquarters or Mechanized Regiment HQ. If they built the Mechanized Regiment HQ you can rest assured that they are converting munitions to fuel and are trying to get a Panther as quickly as possible. But this means that they are not healing any of their infantry. this is the best time to start spamming tier 2 MG's mortars and ZiS. If you are locked into tier 1 its a bit more tricky. the best way to kill the Schwerer Panzer HQ with Tier 1 is with satchel charges... it will tak between 2-3 to kill it so that means you will need to attack it all at once with preferably 4-5 units. 1-2 to (eng squads, conscripts) to draw fire and the penal squads to rush it to throw sachel's. mind you you will also need about 135 munitions to do this.

also keep in mind that if he has gotten an early Schwerer Panzer HQ he probably doesn't have much unit presence on the map. Allot of times (most of the time in my experience) its more efficient to simply ignore it and attack all the other parts of the map, and starve him of resources, delaying his ability to built heavy infantry/panthers while building up your forces in preparation to the Panther that will be on the way. I usually do this but mining all the choke points that it will take.