Dungeon Keeper 1 "launches" but fails to load after menu selection?

Trying to run this on a Steam Deck in desktop mode. Launching the game generates a popup selection menu to choose from the core game, DLC, audio settings, and language settings.

Choosing to launch the game or its DLC closes the menu and starts something DOS4GW which closes the entire dosbox within a second or two. I have tried proton and proton-experimental with both results failing.

The only game I've tried from GOG via Heroic on my deck before this is "Fallout Classic" and it works fine so it's a setting on my end that I likely don't understand.

Log is attached as per the FAQ
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