Are you the Ben Coulthard who runs Sweeper Hire?
Not been personally involved with any form of aircraft ownership but do know that my current school leases all of its aircraft on the same sort of basis that you seem to be wanting.
I dont know what terms and conditions these are operated under but it obviously works out for somebody as they have been on the school now for some years.
I cannot offer any advice yay or nay but offer my observation that it is possible.