There were only 3 possibilities for conversion in order of best to worst:
1. Using both disk copy 4.2 and dart on real or emulated classic Mac.
2. Using lisafsh-tool, works fine for RLE and some, but not all. LZH images.
3. Using disk copy 6.x (tags are lost, but this is ok for xenix/uniplus/macworks with HFS I think) and tags can be recreated for the boot block/loader blocks on Xenix/Uniplus.
Looks like we're about to get a new tool! 😃