Where I work unfortunately we don't have ones that give you a great range of movement. Well you can move but it usually means loosing bubs heart beat and readjusting it alot. You can use some good sticky tape (if not allergic to it) over the straps which seems to help.
With the scalp monitoring it does require a vaginal examination which often takes quite a bit longer then a normal vaginal examination. I'd say its similar discomfort. Also you have to have ruptured membranes to have the scalp clip put on and nothing like Hepatitis, syphylis etc due to the risk to bub. Its easier to apply when your dilated quite a bit over 2-3cm as the target your aiming for (bubs head) is bigger the more dilated the cervix is.
My Aunty had an undiagnosed breech and her son had the scalp clip attached to his bum. Surprisingly it was still effective