How about a contest?
I live in a small town, and we as a club approached our loal PD and asked if they could radar some of our planes at a contest, they agreed. Granted, in a small town they are not that busy. The next time we asked they just lent us the gun. All you have to do is ask, whats the worst they can say, "no".
Someone in your club or a friend of a friend must know a cop. Offer them lunch or something.
The only other rule I would add is no diving to gain speed.
As far as classes, I think to keep it simple at first we should not divide things up. Just the fastest prop driven plane on glow fuel. Maybe RCU could donate a prize, but in my experience the quickest way to ruin an event is to offer a prize, especially money.
I am suprised the AMA doesn't have an event like this in their rule book, they have r/c pylon and control line speed and racing already.
Whether this ends up being a contest or not, I'd like to see some radar speeds posted here just to see what some of the plane/engine combos are capable of. To be honest I think we have reached the peak of performance from the currently available engines.