I don't see the big deal nitpicking a wheel to wrench icon as people will adjust and new members won't know what was history. If it's that important to keep the wheel on your forum, and you can't modify it yourself, $10 ought to go a long way to appease your members.
The real focus should be on core functions and not stylistic changes as they're mere template edits in comparison so developers can focus on bigger things that, by the looks of it, many have wanted for almost a decade now.