T-Unit Multi wouldn't be worth it. There are only 5 games, 2 of which are NBA JAM and one (MK2) has a unique sound board. Most PCBs don't have the header for the ROM expansion board either. so the best multi would still be one that plugs into the ROM sockets.
Y-Unit multi would be better given that there are more games with a greater variety. Still have the multiple sound board problem though.
despite their being 3 sound board "types" across Y-Unit and T-Unit nearly every game has a unique revision, which would likely result in there being a specific donor games that have the most universal revision of the appropriate sounds boards.
As for Wolf Unit, it really just needs high capacity ROMs. Something similar to Darksoft's Namco System 1 Multi would be ideal.