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I made this enquiry of Zeagle when I was looking at gear. IIRC, their advice was that it is possible with doubles, as the bolts sandwich the BCD between the plate and the tanks. Not possible with singles though, I believe.
I ended up putting a ranger wing on a Zeagle backplate, and using Zeagle integrated weights and "tech pockets"...it ends up being halfway between a BPW and a Ranger...and works extremely well!