I don’t want to re-start any old HMD wars (I own both), but I have no issues (with the following tweaks) reading the gauges in the Rift CV1 which I think is the same native res as the vive.
Perhaps the following approach can be replicated in SteamVr somehow …
The idea is to halve the ingame scaling but double the SteamVR scaling.
I don’t know if you can have 30fps reprojection in the vive using steam VR, but if there is a way to use the OpenXR with the vive, I think it can do 30fps.
Just trying to be helpful, maybe this link will prompt some ideas.