I like that idea too, using a button combo to change views gives a lot more options

I disagree with disabling the lean function for players with raised weapons, you should be able to run effectively and I think it makes sense to instead move the camera view toggle to the options menu and leave lean functions

This is actually an amazing idea as I've been struggling with the same control issue and find it very awkward as well- I would like to comment that the toggle lean (via L3 R3) is much easier, it is how Insurgency Sandstorm does it I believe. Also I'd like to maybe suggest that while in point shooting stance, if you were to hold L1 which would in normal stance allow you to move your head independently, that it would do the same in the point shooting or weapon raised position, this is similar to how Arma allows players to look around while holding their gun up, and is extremely useful.

This is consistent with my experience on PlayStation as well