Good idea IMHO, and this is called MorphOS (or OS4)... 
In practice, this would result in some hardware based UAE solution. The question "what's the point" comes to mind.
No, I'll stick to what I said earlier: Make it either "Retro", or "NG". Don't get stuck in the middle!
Why have another Retro Amiga? IMHO emulators such as UAE do the job well enough. OK it may not be perfect but for me it does the job well enough. The way should be NG probably requiring a rewrite of AmigaOS for either Intel or ARM processors,most likely the latter.
