I have not tried that exact combination but have several SLR blocks, you will have a hard time finding anything adjustable with clicks that is smaller.
Remember that everything flex's a little. If you load a bipod heavy you get deflection, with some rails its very noticeable. I would track down someone who has done it the same way you want to. Or just be prepared to get the dremel tool out and make it work your way, there are no rules against that. A relief cut to clearance it is no biggy in my book to get something you want.
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