None of the vanilla ground attack weapons have adequate accuracy and, to a lesser extent, 'damage power' for your entire airfleet of Stukas to reach what Rudel achieved himself. So yesterday I went into the device editor and tweaked (Not. Applied large multipliers in a couple of cases) the weapon accuracy and effectiveness. I don't understand all the values - some seem to run from 1 to a hundred which would make them percentage chance, unless the developers have chosen to be particularly devious and I am not sure that guns and bombs are working on the same scale, since bombs appear to be MUCH more accurate than guns and that seems dubious to me. Others go up to thousands (not for Stuka weapons, which generally have negative damage (not true, exaggeration for effect)). Anyway, as far as I can see, Stuka B and D's have zero chance to destroy an afv, except with bombs. A hundred Stuka G's have probably a 50:50 chance to destroy an AFV. Hs129Bs would be similar, maybe slightly better and FW 190 F and G's have essentially zero chance. Trouble is, I have never actually destroyed an AFV with a Stuka in 5 months or so of play. I expect that claim is an exaggeration, but it is a very small one. So I have upped all the ground attack weapons - both sides - and restarted the '43 GC, where they are all in play. So good choice in one way, very poor in another as the SU has air superiority. I am certainly taking more AFV losses than before and, with liuck and good management, maybe I'll start dealing out more as well.
So that is all semi in answer to the question: create a 'Stuka R' in the aircraft editor, with alll the enhanced properties discussed by others, then go to the device editor and create special tank buster cannons and bombs with excellent accuracy and damage levels and use these devices on the Stuka R. Either have no factories to make the Stuka R, with just a pool to draw on; end of pool, end of Hans. Or 1 factory, max production 1, which will ensure Hans and his buddies will last out the war. Smallest air group you can create/have is 4 aircraft (which I don't believe can be edited), so Hans may have a couple of wingmen with him. Create his only Stab in the editor or just manually change aircraft in the game.