The difference between the taller and std mounts. Not a whole lot, kinda depends on you and how much muscle memory you have in your current position. It is a different index on your jaw. I am definitely off my jawbone, or traditional iron sight position, and slightly above my std height position, and maybe just below my laser position. So if you can "de-couple" from a set postion on your jaw line, and let this "float" as required, you will be OK. If you depend more on a set contact point, then you might have trouble. I find by emphasizing the push by the other strong hand into to the shoulder pocket, I let the jaw contact be what it needs to be, so the eye is looking as straight through the tube as possible, rather than insisting on a set point of face contact. So my left side is rigid and pushing into the shoulder pocket, but the right side is relaxed as possible, to allow for independent trigger finger movement. My eye seeks out the tube first, and the jaw contacts the stock where it needs to be, rather than having a set index point. Depending on what mode you are shooting in most frequently, you will then build up muscle memory in that position. I have seen my buddy illustrating stuff in day light classes, where his default setting was so engrained into shooting under NV, that he naturally lined up there and then adjusted to day optics. It pissed him off but I thought it was pretty impressive. Not many people have the reps under NV to do that.
I have only switched up in training exercises. It's not something that would be easily done on demand; rather like taking a security halt, rigging up for passive engagement, as say part of getting ready for actions on the objective, then carrying on. Obviously having BNVD's makes this technique seamless, where running MNVD's requires a stop, and adjustment of equipment. So yeah you could say that this technique is really for BNVD's and have a valid point.
But.
My main take-away has been how much I like shooting from a raised sight position- all the time. So for me, this trumps not being able to co-witness BUIS. That's just my preference, obviously there are many others.