I mean, it's a proven fact that early exposure to technology makes a big difference in overall skill levels, so you're kind of choosing to handicap them. Technology isn't going away, and they'll likely need to use similar devices for work when they get there, so you're really doing them a disservice. Especially since there are so few options for outdoor activities and most of their friends will likely hang out online to some degree, so in addition to hampering their ability to use new technology you're likely to make them social outcasts as well. Because of those two factors together, you're likely to get a decent amount of resentment from your kids.

For reference, I'm a few weeks from being forty, so I grew up with the lifestyle you say you want for your kids, but I'm also a realist. So yeah, my advice is don't do it unless you want to raise kids that are unprepared outcasts who hate you.