I do not know the answer to your question. Robert White co. has a very fine reputation. Send them an email. I am quite sure that you will get a dependable answer.
I find I only use a couple of filters on a regular basis with my R3M, a red and a polariser. It is not a great problem to just change the filters as required (they are screw fit). So I personally would not splash out that much on a filter system, not for an RF camera.