If President Trump somehow became Speaker Trump the best thing he could do would be to defund any Federal Investigations against him, including Jackoff Smith's He could also defund the FBI DOJ and CIA and push for border security.
But that's about it.
Impeachment would dead in the Senate.
And a border bill would likely die in the Senate too.
But at least he would be able to get these Federal Monkeys off his back and concentrate on running and winning in 2024.