World of Warcraft - can't assign sole dead keys to keyboard shortcuts

In WoW, I can’t assign sole dead keys (like ´ or ^) to keyboard shortcuts. Combinations like Alt+^ are handled correctly. Is there a way to configure how dead keys are handled by wine to make that work?

Ubuntu 18.04, nvidia driver 415, WoW 8.0.1 installed though lutris installer. Updated versions to wine-tkg 3.21 and dxvk 0.93, problem persists.