That race weight, cage tube size issue is wacky to me in a very pragmatic way. My Golf is right near the cut off. I used smaller tubing. HOWEVER, I could race overweight enough to make the actual weight of the car higher than the cut-off. We have minimum weights, remember - there's no law against being too heavy.
I would agree that the first choice would be to find a way to integrate them back into B, and it seems like with sufficient political will, it's got to be possible somehow. I have to confess that recent experiences with the RX8 have left me with a new appreciation for both the challenge and the importance of finding a fair way to include the rotaries.
One comment though - part of the problem is the perception among non-rotary drivers that the cars are magic-fast. THAT is a result of a long history of easy porting cheats having artificially inflated both actual and perceives on-track performance. I hear of gentleman's agreements in IT7 about how much is OK, "since we're only racing against us." I see VIR lap records for IT7 and ITA that are essentially identical.
I see lots of easy pickin's for people who want to scuttle the idea of integrating the cars into B.
K