Another real embarrassing question

[Duck on Wheels]

OK, pretty much all women menstruate. Or did at one time. So luckily there are experiences and suggestions out there. But what about us with an ileostomy? Anybody have any help to offer? That's one problem I need to solve if I'm to do a century come Spring. As my right leg goes up, it lifts the ostomy bag, and if there's any contents it gets shoved up towards that little margin of skin not covered by the wafer. After 20 miles today, my skin was itching. Basically, that's the enzymes "digesting" my skin, and the wafer backing! Soooo ... I'll have to carry emergency supplies in my hydration pack in case of appliance failure. I'll have to have a fresh wafer on and my skin well prepped. And I'll have to use every portapotty they give us to keep the bag as empty as possible. And definitely never any slinky bike shorts that press against my tummy. But is there anything else that'll help? Any techniques? Or ways of adjusting the bike? Or type of bike that would be better than a hybrid/comfort bike (road bike, hunched over, I'm assuming would be worse!).