You should have no issues at all. Just use the RW in a higher concentration as your lube. Blackfire RW is awesome stuff. I used it and loved it! Right now I am using Pinnacle RW/w carnauba and I use the Blue Nanoskin Sponge for my "claying". I say go for it and enjoy your work.
IMO RW is cheaper to use and it can be used for a variety of things. Claying is one of them.
CJ
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BFRW actually has a dilution ratio for clay lube. I don't think it is on the website though. I found it in the BF handbook that PBMG was shipping out free a couple years ago. Here's the e-version:
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