Regardless of how the debate goes, Trump supporters will already defend his performance and conservative media will talk about how Trump dominated and humiliated Biden.
Tbf, Biden supporters will probably do something similar.
We are in an awkward position where the opponents are so polarized that debates and discourse does very little to sway the bases. And the so called undecided votes have such eclectic criteria that it makes it difficult to pin down what they really want.
You could do just that, but it won't make any difference for the GOP base. Biden can debate logically and factually For hours tearing down any bullshit uttered. They'll still claim they won.