Re: a deal for Trump. This is all fantasy but I'll play along:
Instead of pardons for the federal crimes, you offer a non-prosecution agreement based on DJT fulfilling a number of conditions. Admissions of guilt. Never running for any office again. But way beyond that. He has to publicly admit that almost everything he's said to the American people have been intentional lies. It would be an enumerated list, including the admission that Biden and dems didn't steal the 2020 election; rather he attempted to defraud the American people in a number of ways, including fake electors, march on the capitol, bogus lawsuits, etc. And, he has to out an enumerated list of GOP pols as liars who are only serving billionaires and big corporations, explain all the rhetoric from the GOP and Fox/right wing media about things like immigration are lies designed to dupe the public to vote for a party actively trying to shit on the average American. He has to expose how GOP's get bought by the mega rich, corporations, and malicious foreign enemies. The list could go on, but the gist is something that would finally annihilate the GOP.
He fails to fulfill any of that, you prosecute.