He could do a Lewis 2000, if he could find HWs that were ranked as "Foreman" HWs. So could 1988 Mike Tyson, under the same circumstances. https://www.boxingforum24.com/threads/george-foreman-against-5-boxers-in-1-hour.687000/
Anybody with really good stamina could perform this feat in superior fashion to Foreman. I'm thinking guys like Frazier could do it.
Most of the old greats could do it, considering how many rounds they used to go for. Greb could do 10.