Uhhh. That's inconceivable. Stupid even
Borrow my Slate. Its faster than your touring bike, and has a mtn bike lefty fork. You'll thank me.
Seriously, while I appreciate the challenge, I think ultras are foolish in that they likely take way too long to recover from and set you up for afib late in life.
Anyway, I'm nearby and will provide any support you want. Even if I think its a dumbass idea.