The Germans have already have a good air to ground plane, two of the actually: the Fw190F-8 and Bf110G-6. The F-8 with its 12 rockets, 550kg bomb (1k lbs), and dual 20mm can do a gv or two in quite easily. The 110G with its dual 30mm, dual 20mm, 7.92mm MG's, and dual bombs (550kg) can make any gv's day a bad one.
I do agree though.. that adding in the Stuka with the 37mm tank busters would be fun. It would be much like the Hurricane IID I'm sure, but with German markings.