What are the odds the current Supreme Court majority are going to uphold voiding Trump's pardons? Pretty to close to zero.
The only way you could do this would be if you changed the SCOTUS composition through court packing or impeachment or constitutional amendment.
If you wait for the conservative justices to retire and be replaced through death/resignation – by the time that happens, the issue of voiding pardons will likely be mostly irrelevant, because most of the pardonees will be already dead. And that's assuming the political fortune to be able to replace them with justices of a different persuasion, as opposed to just more of the same.