What's the longest you're looking at in terms of having to deny yourself a bathroom and how long would you be able to give yourself to recover first? I won't lie, it can definitely be done but probably not soon without drastic measures. If you need to go 6+ hours - realistically it could be 12-18 months before you get to that point even if you take to the pouch well. You can do a lot of things like juggle medicine and diet but for the really long hauls it is going to be tough for you until, at absolute best, 6 months. You'd also have to look into what the effects of pouchitis or cuffitis would do. I'm assuming if you manage with UC you can manage with one of the -itis but something to think about.
I know several people that have similar positions that can't just run to the bathroom and do just fine. I know others that don't. The important thing to remember is you don't have to forever choose between your career and your health. Absolutely worst come to worst you can always revert the pouch back to an ostomy which absolutely can pass a class 1 medical and still leave you pain free. Obviously this isn't a great option if you can avoid it, but it is an option that will definitely let you keep your job.