do you have any parts boards laying around?

maybe battery exposed ones?

if so as a shot gun type fix, you could remove 4 ram chips from any of the various macs,   even the 4 ram chip that come on the LC. Or any 4 of the 8 that are on many of the other various 68k boards.

then remove the 4 on your board...(set em aside)  clean up the pads nice and good with flux and wick.  and flow the 4 replacements down.