First JST is not abandonned. I just resurrected it, mainly to make whdload slaves run without whdload and with kick 1.3 support. Btw source is now available.
A cd32 loader would be an independent program, that would reuse some parts of whdload emulation and the rn cd loader.
It would not be possible to quit back since most games use 1mb, and quitting back to wb would be reserved to 512k only games so I won't do it.
I m currently collecting technical info and source. Maybe I ll do it myself or maybe someone else will step up.