The problem is that Zune tries to be a MUI clone, meaning it replaces MUI's libraries, classes, etc. with its own and you can't normally run multiple versions of amiga shared libs, GUI classes, etc. at the same time for compatibility with specific app version dependencies (where binary app X needs version Y but breaks with version Y+1 and higher.)
A workable morphos version of zune would basically install nothing to some little bit for zune internals that practically nobody really uses, because they prefer to use the already port-ably defined MUI functions.
I think it was kind of silly to update the Zune bounty without a volunteering developer to steer it towards what they thought they could and would do.