I would like to install excel, word and powerpoint without windows, because carrying my giant laptop to uni is less practical than the tiny steam deck and a small keyboard. Is there any proton magic that allows me to install the programs? I don’t care about one drive and online features.
Not Office 365 itself but you can always use the web version of Office 365 which has most of the features anyways. It works very well.
For an offline solution, look to LibreOffice.
Have you used Excel online? It’s pretty much unusable for me at work. I’ve needed missing features about 10 times this past week and that’s not even including dozens of weird bugs that are impossible to address. My (Linux) team is switching to using Windows remote desktop for Excel because of how many problems it has online