I don’t know all the ins and outs of the 25th, but, I think such actions have to be carried out by a majority of a president’s cabinet, as one step forward. Would anyone in his cabinet want to remove Joe from office?
The 25th has never been used, so perhaps there is reluctance on the part of anyone, to make history, and be judged by history, for the use of that amendment.
The only time you will see the 25th used is when the president is totally incapacitated.