Specifying WINEDLLOVERRIDES=“winmm=n,b” %command% in the launch options did not seem to take effect when I tried.
Adding the override for winmm in winecfg (launched via protontricks) worked for me though.
This is already possible via the DPYes loot filter options 
I don’t really play Crucible, but it seems to still work fine with Grimarillion for me.