If you really need brakes in the up position there are some units on the market, specifically for cykelcross. They are small levers that tap into the brake cable and work by effectively shortening the cable housing. If you don't feel secure about braking with RB brake handle positioning it can be detrimental to your safety and overall riding experience. Check them out. They are a bit pricey and unless you are very handy and well equipped, will probably need to be installed by a pro, but they are way better than the "extra brakes" that were standard fare on mid range "racers" and department store bikes of the 70s and 80s.