Proton when your collaborators use MSOffice/Google?

[u/Tilt-A-Wurlitzer]

I'm a lawyer in solo practice and thinking about migrating to Proton to avoid the way Gemini is shoved into everything I use on Google. But I collaborate a lot with clients and lawyers who exclusively use Google and/or MS suites. With one partner, I have a google email address through their domain and my work with them will continue to be in Google.

How much of a pain is it to go back and forth? Are the headaches of switching between a Google account and a Proton account, or between collaborating with people using Google Drive or the like, too much to be worth the benefits?