A clone movement is a first for me as well, and there are advantages to having an ETA version as you said. I was intrigued with this one and its ability to receive gen parts which I wanted to try. And so far so good. Gen winding module and rotor will be the next upgrade.
Honestly, just the cost of the gen. full balance setup of the 3235 is already much more than the cost of the whole watch. Not taking into account the chances of failures at other parts of the rep movement as time goes by. Gen. Rolex parts are crazily priced and often hard to get access to.
I was thinking for a gen. balance setup swap too, but after I checked the cost I withdrew. I am considering the route of swaping for the gen. escape wheel and pallet fork instead which has a far more modetate cost. Just my thoughts.