I think I'd stand by my original.
If you G-reg has ever had a repair to a scheme not approved by the FAA (remarkably common), the repair needs unpicking and redoing. That applies equally to any repairs performed on previous registries.
Any non-standard (non-TSOd) radio kit needs to come out, you need to prove that the materials used for the interior would meet an FAA flame test, all replacements parts in the history of the aircraft to have a 337 available etc etc etc
I am convinced that it can be made prohibitively expensive for any aircraft to be put onto the N if the DAR is of a mind to do so. Fortunately, most are not that way inclined.
2D