Here's a happy thought:
Unless a court completely exonerates Donald Trump by vacating and over-turning his felony conviction, he is always going to be a convicted felon.
He'll die one.
This is a lawyer ad page, but it has information on how vacating/expunging a conviction works.
https://rhodeslegalgroup.com/criminal-law/vacating-expunging-felony-conviction/#:~:text=You%20cannot%20have%20any%20crimes%20pending%20or%20have,have%20been%20discharged%20for%20a%20Class%20C%20felony.