You probably don't have one to test, but since that card is officially compatible with a IIsi, I would be curious to see if the accelerator worked in the SE/30 with a IIsi ROM installed, booting into OS 7.1 (which doesn't require any hack to run on the stock SE/30 ROM or IIsi ROM or IIfx ROM).

Would anyone here happen to know how to contact one of the design engineers who used to work for MicroMac?

(He he... ~tl and I posted at almost the same time. Fun to see we were thinking the exact same thing!)