David

Good for you. Bear in mind that my doctors do NOT put in very many buttons at all but lots of tubes, so as fellow human beings, they are comfortable with the familiar. I think that is the reason why everyone does not get a button, most all of us just go at first with what the doctor recommends, and they all know tubes. Don't forget, nobody whether a child or adult can start out at first with a button, everybody has to start with a tube which lets the stoma form. Plus this is not an irrevocable decision, you can always go back to the tube if you don't like the button.
The size of the hole in the child's stomach and the adult is the same whether it's a button or tube, so I don't see any investment opportunities. Plus a lot of ideas you may have are already on the market or home made. here is a link to some of them Oley bright ideas
Last but not least, you can swim with a tube. Our own ChristineB has gone swimming and she has a combo G and J tube.
I'm heading out to the pool this month myself.
Keep up that adventurous spirit and I may be joining the button brigade myself
Charm