Hmm worked for me out of the box with Proton about a year ago. I only ever played the single player part though. Did you check proton db?
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I've had success installing Origin via wine by using winetricks in the game's prefix directory and enabling that setting that shows the virtual desktop (not entire sure what it was called - probably just virtual desktop).
The problem for me was that for some reason my desktop environment (i3) just wouldn't show the Origin installer window, so I couldn't click Continue on it. Enabling the Desktop fixed that though and everything was smooth from then on :)
Hope this helps and good luck!
Have you tried running it through Lutris? I'm pretty sure there's an install script for it that works well.