I had blood with cuffitis like you describe and didn't do anything about it thinking it was normal. By the time of my first year scope I had graduated to having a lot of pure blood every couple of days in the stool. Diagnosis - cuffitis. You are doing the right thing in checking it out and Sue is right, the blood you are seeing is increasing and you are anemic. If it's not cuffitis it could be something else pouch related that is bleeding and you need to know and get better before your trip!
I also had more BM's with it but subsequently found out I had C-Diff too. They both have similar symptoms so that's another thing to think about too, getting a stool sample tested. Although I don't think the C-diff bleeds.
I agree on you about setting for the test, no way could I sit for 3 hours straight. Could you get special circumstances where you are in a different room or somewhere where you can periodically stand for a while? So much of this is unfair, that's life tho.