Brad, I can't help but wonder if you are seeing the collecting of early arms through the lens of Colt, Winchester, and military pieces where I understand that any replacement, restoration or change of finish to any portion of a gun renders it unfit for acquisition. I understand that negativity, but at the same time, I understand that these exacting standards are changing. Consider a Colt Walker; not many around and most have been fooled with in one way or the other.
No matter it is still a six figure gun. They reek of history and suffered from heavy use.
Kentucky rifles suffered much more for a longer period, and so, collectors tend to be more open to putting them back to a reasonable condition. Adding signatures, engraving, patch boxes. inlays where there were none, and so it goes, is forbidden and the experienced collector will detect these negatives.
He may still wish to buy the gun even so. It is an individual decision and few do so with a monetary gain in mind. The rule is that you can do reasonable
restoration, but not doing harm to the piece. I appears that there is still a chasm between the collecting groups, but we hope that your interests and research inspires you to come over to our side.
Dick