the plan has to get real serious real soon...congress set to vote on the 25th amendment on Wednesday...
Can’t do 25th without Pence
Section 4. Whenever the Vice President and a majority of either the principal officers of the executive departments or of such other body as Congress may by law provide, transmit to the President pro tempore of the Senate and the Speaker of the House of Representatives their written declaration that the President is unable to discharge the powers and duties of his office, the Vice President shall immediately assume the powers and duties of the office as Acting President
Voting on the 25th amendment is not going to do anything unless PENCE decides to agree. And then the required number of Cabinet members also IIRC.
Initially POTUS just informs them that his fine, and continues on. Eventually, if Congress decides, it takes 2/3 vote in both houses to remove POTUS for inability to do the job.