Id just give up the car, it would wind me up far too much to bother with. I had to sort some kids out just before christmas, using the carpark out the back of my appartment block as a short cut & using the bonnet of my old car as a spring board to get over the wall. First noticed when i had muddy footprints all over the bonnet. Dont think they came back, the celica bonnet was pretty sturdy but the supra bonnet wont take any abuse, so id have to kill them if they did it again.
move house?
ask neighbours if they use their garage, rent it?
You can buy self assembley metal garages!
build a shelter/ car port?