hey i persevered and used a crib tent. can't remember exactly when my DD started climbing out - prob earlier than your DS. worked like a charm. we just switched to BGB mid summer only bc she was asking for one. even though eventually you will switch to a bed it is so helpful. i did trust my DD walking around the house. my DS yes...my DD - she will walk right out the door.
crib tents can be hard to find but it was a life saver.
even though my DD is about to drop her nap, she is still goign to have quiet time in her room everyday.
also, my DS went thru a nap refusal around then as well (he didn't climb out though at that age) and we persevered and he eventually started napping again.