I have never had a problem obtaining interceptor, it may take going from vet to vet, but usually by the 3rd or 4th one, you will find one that's "chill".
Just bring some print outs of Dustin Dortons dosage instructions and some fact sheets on redbugs. and acropora, show the vet a few pics of your tank, and a close up shot of RBs on a coral.
The one I found was so intrigued by it, he actually started asking me questions about reef tanks as he has thought about setting one up, his clinic didn't carry interceptor, but he gave me permission to use him as the prescribing vet on my 1800-petmeds order.
May take a few tries, with the pictures you provide and documentation, it wont be too hard to find a vet that will prescribe it.
Just my .02