Though Initially speaking I wasn't set on this, as I began to mentally map out the Third Great Ninja War, I considered this possibility as a possibility. It also began to shape certain events. Thus Here's the rough idea of whom would join the Harem.
I figure that Hangetsu will need to repopulate his Clan and expand his Bloodline a little so here's who entered My mind initially.
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Mei Terumi
Tsunade
Pakura
Minamo Funato
Suiren
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I should also bring up that I planned on Han eventually taking in Certain characters from Boruto, Naruto Shippūden, and Naruto, specifically Hebiichigo, Buntan Kurosuki, Hotaru Tsuchigumo, and Kyohō Fuefuki.
It's just an idea, but it's not without its merits....