I spoil my lovebird, Kirby, like that, and he's just fine. I think though that you shouldn't spend more time on him today than you can reasonably maintain for his lifetime. Because if you ever get involved with a new pursuit, and they DO happen (i.e., new job, new SO, new puppy, additional bird, etc.) Joey will suffer. So, most people just spend an average amount of time with each bird and it balances out and also teaches the parrot to play securely on his or her own, too.
As for the outdoor aviary, I have one of those. I use it for all my birds (rotating them out there one by one), especially in nice weather. Mine sits on the covered back patio, at the far other end from the grill, so they never get smoke in their eyes and respiratory system. They really love being outdoors. When they come in, they go right to sleep after playing hard all day, swinging from ropes and watching the outdoor wildlife.
I'm not sure about a budgie diet. I'll have to let someone else answer that one. I would assume it would be similar to any other parrot: sprouts, veggies, greens, seeds and nuts appropriate for parrot size/type, pellets, mashes, cooked food, birdie bread, and some small amounts of fruit and treats. My lovebirds love food on their skewer and will try new foods they ordinarily would refuse. You might try that.
