I wonder if Krashan would consider porting Reggae to 68k given a big enough bounty? That's assuming that it isn't reliant on MorphOS specific features.
Would be a funny experiment and in theory there are no serious obstacles. It wouldn't be trivial, but isn't technically impossible. However in Prisma case it would not help. As far as I understand, the card takes an encoded stream, decodes it, performs D/A conversion and outputs analog audio. There is no way to get decoded PCM stream back to the computer. Then Prisma is equivalent to Reggae demuxer + decoder + output classes merged into one. Not very useful.