Can't you watch YouTube 360 videos in the round with virtual desktop software? Something like BigScreen, I think, should work (haven't used a Vive in a couple months).
Edit: cursory googling suggests the BigScreen devs, as one data point, intentionally don't support 360 videos. Personally I agree that's the right call (360 videos are not good experiences IMO), but seems to be an odd omission for their software. Still, I'd be surprised if YouTube 360 is totally inaccessible.