Help - gate latches and hinges

[wb4rt]

I give up on picture orientation.

I am going to build this gate in a breezeway. The walls are stucco over stud wall construction. One problem is the studs are not lined up from one side to the other - about 4” difference. I can deal with that.

My questions right now are the hinges and latch. I cannot use a cane to make one gate fixed so the latch has to keep the 2 gates in place. I’m thinking a slide bolt that can push from either side into a long enough tube to secure or else a latch that rotates up and down 90*.

Second question is what are best hinges that only let the gates swing one way. I think weld-on barrel hinges are probably the best. I guess I would either use stops on one side or else offset the hinges.

Any guidance, recommendations, or links to best products are very much appreciated.