Maybe those who need extra room in the condom ask the escort when phoning them for a booking should help the escort prepare.
I think planning is the key to punting to help minimize for an uncomfortable experience. I also like to plan ahead with things from an escorts side like many others do.
Or Maybe bring your own large size as an emergency back up. Ask again on arrival then ask to see them. If she doesn't have ask to use your own.
If denied then it is your decision wether to pay. Just some thing I would do if was a client. I am hoping to inspire others.