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.