Why stick an "Amiga" sticker on a x86 computer running Linux? It makes no sense now and never did.
I might be tarred and feathered but here's how I'd have done it:
Develop a case that looks like either an A1200 or A1000 case (or a 2000 or whatever. Something iconic looking)
Develop a nice, high quality keyboard to go with it (no cheap boing balls here), complete with proper "amiga" keys and branding.
Develop a proper amiga mouse. I dont know if there'd be a future for a USB "tank mouse". I'd buy one but maybe I'd be the only one.
Develop a desktop environment for linux that actually feels amiga. AmiWM is not enough but it could developed more, or something could be done from scratch.
Be upfront with what it is going to be, and voila. Don't pretend to be the second coming of Commodore. You're selling a novelty case, keyboard etc, and it's a nice, consistent package.
Of course, this requires investment and money but if you were a hugely successfull business man, no problem!