Regarding the "Reverse Hendrix" thing, I've sometimes wondered if the reason Jimi preferred playing right-handed Strats left-handed was simply that the reversed nut would allow an exceptionally low action for the thin E, B & G strings, and an abnormally high one for the bass strings. He made extensive use of "hammering on" on the thin strings, and he used to really pound the bass strings.
Or it may simply be that he learned to play on reverse-strung guitars, and found it easier to keep doing that.
I wasn't like he was short of a quid; if he really felt he needed to play a proper left-handed guitar, he would have been doing so.
I expect that new nuts were fitted and slots cut as necessary. He wouldn’t have used the nut as it was. The slot width for the low E string would be far too wide for a .010” high E, and the high E slot wouldn’t accommodate a .038” low E (his Fender Rock ‘n’ Roll strings did have thin bass strings compared to today’s norm). There would be poor tuning stability when using the trem if the strings just sat on top of the nut, and hammering on the bass strings by the nut would be very hard to do.
It is reported that he preferred the feel of the strings on a R/H guitar strung left handed, rather than using a L/H guitar, but I have no idea if this is true. No difference between them when playing chords but a slight difference in the feel when bending strings. I expect a lot was down to the difficulties of getting L/H guitars, especially in England at the time. Once he started setting light to guitars on stage, he will have got through a lot of them.
I saw Eric Gales two nights ago (superb guitarist but could do with stronger material IMO), and he’s lefty who plays R/H guitars strung as R/H. Weird to watch. A trait also ised ny Albert King, Otis Rush and Doyle Bramhall II.