Hi Cold Zero,
these are what were recommended to me, though i've not gotten around to buying them as yet, am told they fit the IWS brackets stanag system without any further modification.
MJ1 here on the forum has used these rings with a couple of his iws mounts, he had a few pics even with leupold mk4's (i.e 42mm objective) etc which would give an idea of height.
these would significantly lower the optical centreline compared to your mocked setup & should this need to be lowered further, it wouldnt be too difficult to do on a milling machine.
......however in your instance these are a 30mm ring, so would require machining to open out to 34mm and @ that there may not be enough remaining material? @ schmidt & bender prices, its not the type of thing you do on a whim.
https://www.armsmounts.com/default.asp?mode=products&sub=rings&id=[hsh]21