For both steam and battlenet?
Is it possible to simply say support is unofficial on the box/website and then say it has people working on it, but not necessarily up to date as fast as the normal stuff to avoid legal issues?
This would be a huge step forward if this was easy to do for linux players.
Support:
Proton(Unofficial*)
*Unofficial support does not mean up to date working condition, but crew working on it as extra time is available.