I was just looking for your link to the assn page.
It's not a pain killer, but helps with circulation. It isn't like Bute, but they might still ban it.
There might be an herbal medication that would work, at least in the short term. Try emailing someone on the rules committee.
If you can't find the link google NATRC, their homepage is the first. I don't know how to google on Macks computer.
Becky