MoL wont work, I did once hear a report that it was working but I think that was it, just a report.
I asked the MoL author about it and he said it doesn't emulate old hardware and BeOS PPC won't run on anything very new.
I guess it could be done but I don't know how much work would be involved.
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Zeta could be ported and thats not out of the question but at the moment they have their hands full with the x86 version and then we'll need to convince them it's a good idea.
OpenBeOS on the other hand is on the way already and it doesn't look like much right now but they want to do the engine before painting the bodywork.
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At BeGeistert the guys tried to get R5 booted via Boch and it got to the end of the boot sequence but couldn't open a screen :-(
It's going to be a multi-boot monster!
If we can't get them to MorphOS for whatever reason (religion?) we can still get them to the Pegasos.