Emailed rockshox about this months back and they said the clamp was not designed to be used seperately and basically said no, don’t do it.
got on on my bike fits just fine, as its the same clamp with a extra bolt you can remove, the normal type came with a little alu block to make the gap smaller so morns wouldn’t snap their carbon bars if they over tightens the clamp, but its the same clamp, in short fits just fine, pic of what i mean below, mmx clamp comes with out little black thing in the middle, which you wont need if you’re not ham fisted