I have pics of RAF 2nd TAF XVIE's with standard tips, flying alongside a clipped tip version, wartime, NW Europe. Same for LF IXE's (the same a/c).
...as for the FM thing, again, "I don't know", I have not seen HTC say that, but how is it different than a gondola loadout? The drag, weight, ect, is now changed when you take gondolas, so im not so sure its not doable. I could be wrong. If thats the case then a seperate version is also possible.
The wingtips were changed on both the 14 and 16, and its an interesting option, and historical, if possible.