Wow, that's a challenge.
I know that many cats love being indoors, but then it's also true that many cats have
an adventurous side and love to travel.
Is it possible to chain the cat to a very very long leash, and that way it will be able to go
partially outside, but not all the way?>
Maybe if you give the cat another cat companion then it won't get bored, and then
you'll end up with 2 indoor cats.
I know that certain wild cats (or feral cats) are very well adapted to the outdoors,
as indeed I know 4 feral cats that are superbly adapted to the outdoors.
But for you, I recommend keeping the cat indoors, for its safety.