I designed one Infantry Unit with the Monk armor class, that can heal nearby units like monks (but not convert).
I think this can be used as a way to diversify certain unit classes a bit, with healing units that have also the monk armor class, so they can be killed by anti-monk units.
My Idea was the “Doppelsoeldner” for a hypothetical Swiss civilisation, a strong infantry unit that is more resistant to archer fire, but costs way more gold and - with the monk armor class - has two more counters in the eagle and scout lines in the exchange.