very nice question, had to take my ops manual to check, and my answer would be: YES you can, because for ils cat2/3 rvr report is mandatory, for cat1 and non precision approach rvr is still the costraining report (but if not avaiable gen visibility is acceptable, eventually converted in rvr!!), but for circling approach the costraining met report is ONLY GEN VIS+CLOUD CEILING!!!