Outdoors is dangerous for cats anyways. There is a reason indoor cats live longer, there are predators and cars outside. Cats can be perfectly happy indoors.

If your cat likes being outside, you can either grab some lumber and chicken wire to make a catio or just get a cat harness and leash. Yeah, there is a chance a cat can escape from the latter if it's not properly sized and secured, but once in a while an indoor cat getting loose is much better than having many outdoor cats outside most of the time hunting random fauna.