Hi Nick,
I certainly have not shown that you can convert a Kibler, just speculated that it might be done if someone can accomplish the steps I described. I think it could be done having seen some original fusils that looked like slim fowlers with the changes I mentioned. Of course those guns were not converted fowlers, rather they appear to have been made as fusils from the beginning. It is ironic that there is a lot of interest in them considering not many were apparently made. I don't believe officers carried them at all on European battlefields just a small subset that served in America. Even great collectors and authors like George Neumann present dodgy examples. In "Battle Weapons of the American Revolution" he shows 2 British "officer's fusils", which are highly suspect. The first is by David Collumbell and dated to the 1740s. However, the lock is marked "Ludlam" and the only Ludlam I find was working in the 1790s. The trigger guard is from the late 1760s and 1770s. The other "Ketland" fusil he dates to the 1760s. However, it is musket bore, and has London proofs. Ketland assembled his guns in Birmingham so the barrel was shipped to London at high cost for proofing and them shipped back to Birmingham for assembly. Ketland only did that for of few very high end guns, not inexpensive military guns. The gun is very fishy and likely is at best a commercially made musket.
If I were to try converting a Kibler to an officer's fusil, I think I would order one in hard maple and turn it into a colonial-made piece.
dave