Could you use a 68 pin cable and put the adapter where the cable plugs into the logic board? This will create a small risk in that you have no termination for the upper byte at the logic board end of the cable, but if you use a short cable that should not be an issue.

BTW, if you need any more 32MB SIMMs, I've had a bunch of them for sale for $3 each, plus $3 shipping (total shipping for any quantity) for years now.