I suspect that Pence, and senior Republicans, will try and avoid the 25th Amendment like the plague, or support impeachment, for fear of offending those who have been misled by Trump but still cling to his lies - especially if Pence hopes to be in the race for the 2024 nomination.
Ideally, if Trump had a mere smatter of honour, he would resign and let Pence see out the time until the 20th: no chance of that though, so there remains the risk that Trump would do something childishly provocative while he still can.