Personally I don't think a center right Republican Party has much of a
constituency. I think policy wise Americans are more left as far as policies like minimum wage, healthcare, taxing wealthy and corporations, saving Medicare, SS, immigration, unions, etc. I think a large group on the right are Trumpers or Hawleys or Rubios. I think the old school Romney Republicans consist of some older white people and a majority of the Republican media pundits. So basically I think Democrats need to stop worrying about center right Republicans or Trumpsters and concentrate on making bold policies that will benefit the American public. The Trumpers will be dealing with the remaining centrists left in the Republican Party. Hopefully they will continue to destroy each other while the Democrats make policy that makes Americans lives better.