If all the shoes are of the same size, he only needs to find a woman of the right size who also is a shoe fetishist. Then he can give her a present every week, or let her move in and wear the shoes under the condition they still belong to him.
From time to time, I read about couples where both share an interest in vintage computing or video games, and that each collect different systems. Sometimes maybe one half gets the interest from the other, but sometimes it is the reason they met. I'm not entirely sure heterogenous collecting is good, as in the worst case it will require twice the space as if they had working on a collection together. On the other hand, if a couple splits up, it is much easier to know what is mine and what is yours.
One of the guys who arranged the retro gaming/swap meet recently is a collector of medium size, and his woman had been heard on radio (!) that they didn't even have closet space for clothes due to his computer stuff took up so much space. Then during the meet, there was too much vintage goodies for her to resist the temptation, so within a week she had bought a small horseload of items on her own. I suppose they have even less space for clothes now.. I told her she can't complain on radio anymore.