https://github.com/naelstrof/VRPlayspaceMover

While this application I think was originally made with VRChat in mind, it'll run with ANY SteamVR game. It lets you grab the world with your menu button, and drag yourself around your own playspace without you actually moving. You basically use your hand to offset yourself in your playspace from where you ACTUALLY are.

This makes relying on your VR safety walls pretty much impossible because they don't move WITH you - you're just tricking SteamVR - so do be careful. But this IS a working solution to Unseen Diplomacy's large room requirement. It let me get through it, and I have a 2.5m square room.

I'm sure this is probably totally against the developers wishes, but here you go.