I think an interesting, but more challenging option would be to figure out/get the documentation for (if any) the LCD panel. The electrical interface to the CRT in the classic Macs is already pretty well understood. Then build circuitry to translate the video signals from the PB150 (or other target) so that it actually drives the analog board video circuitry in the classic Mac.

Once the two interfaces are well understood, it really shouldn't be that hard to translate between them, unless the bits are out of order for some reason (writing one quadrant of LCD at a time perhaps?).