It sure sounds to me like you're ready. If your doc is insisting on that 3 week thing, I would avoid that tube feeding in the am and have something orally for a couple of weeks instead just to show the doc. Once your stomach is full in the am, the PEG shouldn't give that "pulling" sensation, though you probably should flush it a little everyday even when you don't use it.
I understand your fear about not having the PEG when you still have to have dilatations, that is one of my issues too (though I have some others, like the medication issue, which you have overcome) but as long as you can get in for those dilatations quickly when needed (also a problemfor me as the place I have this done is in another state), it doesn't seem like your need for those means you should still have the PEG forever.
Be sure to come back and let us know when you get it out. We'll all be cheering!
Nelie