It'll get real messy. Dragging forward Trump-related things faster than they would otherwise happen for anyone/anything else will only reinforce some segments of the population and their belief he's being scapegoated.
Also, somewhat terrifyingly, he's massively outpolling Biden and Nikki Hayley's momentum is starting to fizzle. So not only would be probably win if he does run, the outpouring of grief that could happen if he's banned from standing may make January 6th look like a picnic.