The online prop sim you refer to is probably Aces High; I find their VR implementation very good.
Unfortunately in DCS you can save a custom snapview, but in VR only the position of the head will be saved, not its rotation. Therefore no custom snapview will allow you to check six.
Using Steam VR Advanced Settings I have been able to find a way to have a "Linda Blair" snapview in another VR flight sim (see this thread for full explanation). Since it depends on a SteamVR setting it should work also in DCS, but for some reason I was not able to make it work.
Give it a try, you may be luckier...