Yeah, Hive Time uses Godot 3.4, which has GLES 3 and GLES 2 renderers. Godot's Vulkan renderer is only available in 4.x (which is still pre-release at this time). Vulkan's not a part of the puzzle so far as Hive Time is concerned.
I am truly sorry to hear that the shape of the world at the moment is forcing you to consider ignoring medical advice. It is very distressing that the broad "solution" from humanity at large has been to hang the elderly, the immunocompromised, and others at extreme risk out to dry. You don't deserve to be in the position you're in. I hope that you feel better soon and can find a relatively safe path ahead.