Who put you on subutex ? And what was the reasoning for going on subutex? If it was your pm doctor, then he/she can convert you back to opiates.
If you went to an addictionologist/treatment program or were dismissed from pain management, and that is why you were placed on subutex, you may have a more complicated situation in trying to get another doctor to prescribe opiates for you.
Subutex is used in addiction treatment, and while it is occasionally prescribed in pain management settings, most drs and pharmacists see a prescription history of suboxone/subutex and associate it with substance abuse. If you were dismissed from previous pain management, especially for failed urine tests, pill counts, early refills, multiple prescription from different drs, it will complicate the picture of converting back to opiates.