Nice you made this thread, I needed an occasion to post a link to Individual Computer's head J. Schoenfeld's 2007 presentation of the Clone-A project :
I think the Clone-A remained a prototype unfortunately, but his explanations during this Breakpoint conference made my day.
I like the part where he says the company which claims they have all the intellectual property to the Amiga ultimately couldn't demonstrate they had the right to license the roms to them
. He confirms my intuition that a Kickstart replacement is possible (not suitable for booting the Workbench though) by mentioning 2 programmers who worked on this. All this takes place during the last 10 minutes of the show.