I was a little confused by your question David.
But I kind of get the gist of it.

Developing emulation that would allow MorphOS PPC to run under MorphOS X64 could be done, but it would require development resources that are already spread very thin.

Every developer I have ever exchanged messages agrees on one thing, MorphOS will not be allowed to run under emulation on another OS.

That doesn't necessarily rule out emulation under MorphOS X64, but it does make a generic QEMU supported version unlikely.

MorphOS could run on Power 9 both in its current version, and as an advanced version
directly (aka 'bare metal') and concurrently once the issues with KVM have been worked out.

But doing so under X64 would require a solution such as QEMU, which would increase the cpu load.

Whether its gets done or not is purely a matter of resources.
To the best of my knowledge, no commitment has been made on this issue yet.

Finally, we should probably adjust to retaining what we have now, and what comes in the next bug fix, 3.11.
We knew there would be a period where we would have to carry on before the ISA transition.
This is it.

I don't expect a transition to occur this year.