There are companies that will do exactly what you said (Caster and Nanda come to mind, and I know this from personal experience... I'm one of the slowest guys around. ) but you have to realize the downside for you as a racer...
Here's an example. Per the RC Pro Series rules, if you have a chassis sponsorship... ANY percentage... it is mandatory that you run "Expert" or "Open" class, not "Sportsman" or "Intermediate." That isn't true for other items, but for the actual car it is. It is unfortunate too... because of exactly this situation. IF that weren't the case, I would have taken Mike Battaile up on the Caster deal when he was the team manager. I have no business being a rolling obstacle for the expert guys.
Just food for thought.