The peg or button if he chooses may be better if he can't stand a NG tube. You can just tuck the tube away and at feeding time, untuck and use a 60cc syringe to pour in the formula. Since he is of sound mind, he can be taught to do the procedure and the extended family should be taught too.
Tha mikee button lies flush to the skin. There is a small plug attached that keeps the formula from leaking out. You use an extension tube that clicks in to place and once you have poured in the formula, you click it out and put the little plug in. Some people like this better because it's less noticeable. No long tube to deal with.
Just a little FYI though, not all people react well to a G-button or tube. I had a client who found it uncomfortable and always had granulation tissue in the stoma. (hole) Granulation tissue is red, bloody tissue where the body is trying to heal the stoma but it can't because the tube prevents healing. This happens in a very small amount of people, but it is one of the risks. Most people have healed tissue around the stoma and there are no problems.
Granulation tissue is not really a bad thing, but you have to be more careful it does not become infected and you may have bloody drainage from the stoma. The doctor may consider cauterizing the tissue with silver nitrate. But, as I said, it is a rare problem, but it can occur.
Best wishes and please inbox me for any other questions or concerns as they arrive. I'm happy to help.