Rapid, A couple of concerns about modifying the brake handle.
I couldn't get my aluminum brake handle to bend. I guess if I heated it I might have been able to, but I didn't want to chance taking the temper out of the aluminum.
You also mention making the handle longer. Keep in mind that you will then have more leverage and that could possibly, although remotely, cause you to put too much pressure into the M/C. They say not to exceed 1200 lbs pressure as the seals could give way in the M/C. I can now get about 1200 lbs on mine if I really lean on it.
Another thing to keep in mind about a longer brake handle is that you have a longer stroke with the longer handle and you may not have enough room to reach the lever and apply the needed pressure.
When you are strapped in your arm movement is limited and most of the cars I have checked have about 2-3 inches stroke at the end of the handle.
I strongly suggest you get fully suited up and strapped in to make sure you can reach all the controls before you take everything apart.
Using a hand brake will probably take a little getting used to, especially at the turn offs, as some tracks have a pretty tight turn off and negotiating them with one hand on the brake will take a bit of getting used to.
Is that puke tank going to be big enough if you shoud happen to hurt something in the motor?