I think it's going to be a hard way to go. Certainly not a painless method like most people would like. I guess you have to make the best decision for yourself that you can, though. There's no guarantee of death. If you go through with it, I hope it works out for you the way you want. Good luck.
I don't believe there's any chance of surviving a motorcycle crash into a stationary object at speeds of 150-200 mph, you would likely be dead immediately on impact even with a helmet, the crashes where people become seriously injured are either at much lower speeds or when there's a slide and even then the chances of death are quite high.
Chances are definitely better than jumping from a building, people have survived terminal velocity falls in very specific scenarios, people have survived falls onto concrete from incredible heights but i have never heard of someone surviving a motorcycle crash into a solid wall/tree at such a high speed, you will be launched head first, at the very least you will be knocked out, if your head and brain are not destroyed your neck will probably be snapped better than any drop hanging could ever achieve and there will be incredible damage to the rest of the body.
honestly an incredibly underrated method, i think more motorcycle crashes are suicides than we realize
I've also recently bought a motorcycle with the same thoughts as my driving record (or record for paying attention while driving) is not the best. I have benn picking up risky behaviors as much as possible in hopes that one of them would wipe me out for much of the same purpose as yourself.
please dont try to ride recklessly hoping to have an accident, a random traffic accident is a roll of the dice on whether your fine, injured, paralyzed, braindead or dead.