I believe NH169 and RM704 are examples of clipped-wing high back XIVs
High-back F.XIVes were certainly built and delivered in 1945 - this one to Hong Kong. It's very possible that 2TAF refitted elliptical wingtips to their new arrivals at pilot/squadron request as there are many photos of FR.XIVes (built with bubbles and clipped wings) with refitted elliptical wingtips in 2TAF.
Also of interest, No. 2 Sqn BAF (Belgians) flew at least one shiny silver high-back F.XIVe with clipped wings from Florennes post war.
Overall, it's impossible to say with certainty that the Spitfire XIV definitely did, or definitely did not, fly over Europe with clipped wings and a high back.
We know for certain that it flew over Europe with both wingtips and a low back - so why not give us the option regardless, to adapt our planes to a close analog of modernity in the late war period. I don't see the harm in it, and there's certainly more of a grounding in reality to give the Spit a clipped wing option than there was to provide the K-4 with the DC engine option.