Followed method put forth by nanofoxie, albeit modified. The only modification made was to run the appropriate version of wine regedit in Proton 8.0/:

# Set environment variable for use by wine regedit:
export WINEPREFIX="$HOME/.local/share/Steam/steamapps/compatdata/331970/pfx"

# Modify registry of wine prefix(substitute Proton 8.0 with the directory/folder most closely matching the Proton version in use, or matching the major software version):
proton_dir="Proton 8.0"; "$HOME/.local/share/Steam/steamapps/common/$proton_dir/dist/bin/wine" regedit

HKEY_CURRENT_USER/Software/Wine/Direct3D/MaxShaderModelVS Navigate to and create any missing keys in the path above. To create keys, right click an existing path to add the key. In my case, Direct3D was missing so I simply right clicked Wine and hit New -> Key, setting the name to Direct3D. I then right clicked Direct3D, hitting New -> DWORD Value, naming it MaxShaderModelVS and leaving the value set to 0.