Thanks so much to everyone for your answers! I really appreciate all of your thoughtful responses.
The Warmoth neck route could be the answer (BTW, that sea foam green strat body is absolutely gorgeous). I will check them out, although putting one of those on an Affinity might be a case of overkill-- too nice of a neck for such an inexpensive body. Plus, Affinities have skinnier bodies, I think, which could pose a problem.
Maybe the answer is to just go with the 1.65. I visited one of our local guitar shops today. They carry Fenders and Squiers, and I checked out the CVs, Players, Vinteras, and maybe one of the Americans. The first three had 1.65 inch nut widths, and they seemed quite playable compared to the Affinity and I think I could make that work. I really liked the Player as compared to the CV due to the smooth back of the neck (no lacquer). The Players are going for $749, which is kind of high for someone with my limited skills, but worth saving up for, I think.
Anyhow, thanks again for all the responses. You've been very helpful and welcoming to this noob.

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