If I were in Trump's shoes, I would spend my energy on economic growth, our tax structure, and immigration.
I'd appoint pro-2A Supreme Court justices and similarly fill the 100 federal judgeship vacancies, and let the courts handle most of the 2A issues instead of spending much political capital on 2A legislation.
We might see EOs allowing Korean rifles and our own surplus 1911s to be sold, and we might see restrictions on the import of Mosins and SKSs lifted. That would be relatively easy. And we will probably see a rollback of the ban on use of lead ammunition on federal property (effective in five years) that Obama gave us on the way out the door.
If we get concealed carry reciprocity or freely available suppressors, I'd say that is about as much as we can expect from federal legislation.