I think you best bet is having a high level account with lots of playtime, only buying from small time sellers who also have high levelled accounts, and not buying large amounts like 500m+
You might have a chance on r/2007scape if you're completely honest about not buying gold after the warning. But prepared for the zealots to flame you for upvotes.
I had a warning for gold buying a few months ago, but its no longer showing my active offences. In fact account status says I have no active offences, does that mean I have a clean slate now?