So looking for advice & ideas on homebrewed subclass Monk way of Puppet Possession

[Throne12]

So in my game we are coming to a end of this campaign and players are talking about next game characters. And I got a player that liked and want to play a member of a order of monks from a country in my world. This Continent is effected my a event that is collecting magical energy. So it takes longer for casters to regain spell slots. So short rest classes do better and are more Abundant here. There are also a lot of yetis and remorhaz. So there is a order of monks that possess giant iron or stone Statues/golems to fight these large monsters.

So the player wants to play a monk of this order and all I got right now is you have a puppet/doll/golem that starts as a small object that later can get bigger. Some things I want is you can stunning strike through this Puppet. And I want it to have the same movement of the monk.

So if I can get any advice as I work on this would be nice.