I think the adding that RAM SIMM onto the '040 Processor Upgrade/Ethernet Card is just about all the magic needed, aside from the system enabler that just flat out ignores the icky parts of the LC ROM, of course.

The LC ain't gonna be addressing more than 10MB ever, by the time it can, it's an LC no more . . .

. . . more like a Quadra:

http://www.everymac.com/upgrade_cards/sonnettech/presto/presto_plus.html

.