Hello Richard,
I just looked at that airfield on Google Maps and decided you must buy the Tri-Pacer and fly from there.
What a beautiful area!
https://www.google.com/maps/place/Co...9!4d-2.1572917
The biggest worry will be keeping your clothing clean when you wipe down the plane after flying. Can't use a creeper on the grass.
As others have said here, decent cockpit covers during the wet seasons (covers the side windows to keep away the prying eyes and deter ne'er-do-wells), a reflective window screen for the rest of the year, you will be ok for many years.
I keep one of these in my Tri-Pacer, easy to stick between the window V-struts and the windscreen, keeps the cabin a little cooler, protects avionics, dashtop GPS, etc.:
https://www.amazon.com/Foldable-Wind.../dp/B00YGRS230
You can buy rolls of this stuff and velcro inside the side windows too.
Make a kit to keep in your car that has all your pre/post flight gear in it (towels, cleaning spray, window spray, oil, basic tools, tiedown straps, etc.) until you have a hangar and lockers for all that.