Would you mind trying openhmd with rift in linux (or at least adding the lib to it)? It does not have positional tracking (which means that there is not much imersion), but if there are mores games that use openhmd there will be a higuer incentive to develop positional tracking :)
It would be a great idea but Naufrage was developped 2 years ago. Today I work on other projects. I would have to find the time to reinstall older version of Unity (Naufrage was developped on Unity 5.3 and is incompatible with Unity 2017+) to work again on it...
...and... it seems that openhmd lib on unity is only compatible with Unity 5.6.