I want to point out a couple things here.

The Badger Midgets are nowhere close to D2. If anything they are more like USAC & Xtreme. The only difference between a Honda running in USAC and Badger is that Badger is a max cubic inch limit of 148.82 (vs USAC at 154cid) and no head porting (USAC wide open head porting.) That's it. Otherwise they are the same.

The only thing similar between D2 and Badger is they both require a production based platform. I am not a fan of D2 because they write rules to "restrict" virtually every aspect of the engine, but then can't enforce the majority of the rules they write. There is a camshaft supplier who openly admits to selling cheater cams to a large number of D2 racers. Writing rules that cannot be enforced only hurts the honest racer.