Thankfully elections in the US are not run by the federal government, they're run separately in every state. Trump may be able to illegally get on the ballot in some states with the support of friendly state governments but he definitely won't get on all of them.
Even seemingly-friendly southern states may have state governments that will take a dim view of Trump attempting to get on the ballot. Kentucky, for example, has a Democrat as governor who is very popular. Kentucky has also had its bourbon industry devastated by Trump's senseless trade war. I would be shocked if Trump managed to illegally get on the ballot in Kentucky in 2028.