I have tried truckload of different cages and belts, modified and stock. I really can't afford anything custom made, and I don't think they would work for me either. Last try was Small Mamba cage from ebay. It felt really comfortable, I could easily sleep with it. I used tether spout to prevent turtling. First break in was 12 hours just to see how it works. Later I had it about 50-60 h. It didn't hurt, but occasionally pinching. I started to have edema in two bigger openings, so I took it off. Swelling helped soon but next day came back and worse. Its third day now, and not healed much yet. I think it would have gone worse if didn't stop, it didn't feel that bad. I like to have working penis, so I gave up devices. Now I feel that is this my "home forum" anymore. My opinions are rather different than current conversations. But I don't know where to go, I have friends here, and have had nice private conversations. I could continue without device, but my wife is loosing interest. She didn't react to new cage even we discussed about it before i got it. She only participates when she wants to have orgasm, and other times I'm abandoned.
Keep in mind, chastity is different for us all. There are no rules except those you and your wife set for yourselves. You don't HAVE to sleep in it. You don't HAVE to wear it every day. I recommend you think of what ways it WORKS for you, rather than the opposite. What CAN you do? I still can't go for "weeks at a time" like many. I honestly can't see it. But I accept that my chastity is just as valid. I am sure most others here would agree. Don't give up. Keep building from baby steps.
I don't want to question your multitude of experiences, but wondering if you were ever able to try a custom cage? Your description of excessive pinching and especially edema and turtle going from off the shelf cages makes me wonder if you may have a somewhat larger penis girth than fits in standard off the shelf devices. I also almost gave up because I just couldn't fit into any off the shelf devices and had the same problems you describe. Turns out that every off the shelf device has only a 1.25 or 1.3 inch diameter tube (I have researched them all) and I have a 1.5 inch diameter penis which was too girthy for standard cages even though I am only about 2.5 inches long and needed a shorter length cage. I eventually bought a Kink3D Cobra because they were available with larger girth tubes and realized that chastity could work for me and could be safe and comfortable. I have read so many times and in so many places that tube diameter isn't important because the penis is squishy, but this couldn't be further from the truth. Girth matter, a lot.
I'm slowly healing from this experiment, and I must say that I was little scared if it heals properly. It's not worth the risk, especially when she doesn't have interest in this. Also for me, it's not similar excitement anymore. Maybe something else comes to richen sex life.