Greetings!
I think there's a bit of confusion going on here. I don't see why this wouldn't work as a concept.
The error you're getting is saying that you didn't set the scheme in
BiddingStrategy . You appear to be setting the 'type' when the scheme' is expected. Could you please give that a try? I looked at the requests on our server, and I don't see that field being set. If you are still experiencing issues after doing that, please get back to me.
Thanks,
Nadine Wang, Google Ads API Team

ref:_00D1U1174p._5001USwwK2:ref