It sounds similar to the deal that Spiro Agnew cut when he resigned the Vice-Presidency in 1973. He resigned and pleaded "no contest" to a single charge of corruption, and skated away with no jail time and no conviction.
If something similar is being cooked up for Trump, I'd hope they close a few of the loopholes from 45 years ago:
1. Force him to forfeit all privileges of office, including Secret Service protection for 10 years after leaving (at taxpayer expense);
2. Make sure that the extent of his crimes are made public, INCLUDING any collusion with the Russians (Agnew spent the remainder of his life crying about how he'd been railroaded, pointing to the single charge as "all they had against" him; we all knew he was guilty, and he never rejoined public life, but he still had the audacity to continue to lie afterward); give him NO wiggle room to argue with the findings of the Mueller report (OR the Steele dossier); make him sign a full confession, or sign a document stating that he agreed with the findings of those reports, or failing that, stick him with a non-disclosure agreement (THAT would be a small amount of sweet karma), so he'd risk a hefty fine should he publicly contest the findings.
3. Force him to repay all salary he has collected, and to forfeit any profit gained by virtue of having held the office, and leave him vulnerable to state civil lawsuits by private individuals (he would most likely demand immunity to state and federal prosecution as a condition of leaving).
4. Finally, before a joint session of Congress, he should resign, and then get down on all fours and squeal like a pig for 60 seconds, just for the entertainment value.