Hello Jeroen!
It seems you have found a good reason for me to learn how to build Blender on Manjaro/Arch. Warning, I’m new at builds from scratch, though I just took a look online and I found an AUR from the wonderful Bartus!
AUR script for blender 2.8
https://aur.archlinux.org/packages/blender-2.8-git/
I’m foreseeing this taking me a bit of time to figure out how to edit the AUR package script(s) in order to insert your temp-fix modification…
SO, if there’s someone reading this that is a Arch Linux master… don’t wait for my slowness. Jump on it! 
Again, thank you for looking into this issue, and for responding with a path towards a potential solution. If you have any tips for me as I walk through this AUR package install, and don’t mine doing a little hand-holding, I’m all yours.