A lot of clubs have an aircraft available specifically for long trips away, which isn't used for the day to day training. I know two schools who have a TB10, and one with an AA-5 just for this reason.
That way, they don't see 4 hours a day as their average, and are happy for the aircraft being taken away for even a week at a time without over charging.
Wet or dry rate could probably be negotiated with any club too. Ring around and see what you can find.