I have flown plain bearing .25's(stock) for the better part of 7 years at the beginning of my r/c days and they do not have much power. They are light and cost the same as a brearing .15. We are going to do some testing on props to see which one gives us the desired effect. There is no way in the the world a bushed stock .25 will come even close to the speeds we are flying now. Sorry, I just don't agree with you there. I will test the rpm's on my mag.25gp and let you know but I'll bet it is somewhere in the 12k range with a 9x6 mas.
I have seen the effects of a very thick wing on some fun fly planes and it is pretty dramatic. I have also seen the effects on my planes when you make the center of the wing wider (long center cord length). This alone has added a great deal of drag to my Raptors with out much weight. As for the CD thing, it would be no more trouble than the present SSC rules. It will be very easy to spot a cheater with a single engine/plane/prop/ contest. If you don't have a TT.25GP you can't play, plain and simple. If can't afford to by a $50 engine, to bad. You should have picked a cheaper hobby.
It can work and it will work.