I started with two packages from a local supplier who only treats the bees organically. I had treatment free packages lined up, but they had too many winter losses to sell and so that fell through. I tried just sugar dusting my first year, which is basically the tamest treatment option out there, and I was ALMOST in the same boat as you. I had a colony crash and abscond late in the year, and only by treating the other colony with MAQS was I able to save them. In my area (and I'm under the impression that many people treat around here, although I'm not 100% sure that is true) I don't think doing absolutely NOTHING is a reasonable expectation. I don't want to use chemicals either, preferably not even organic ones, and so I experimented with a trapping comb treatment this year and will continue to do so next year. I can give you the links to the related threads if you are interested in looking at that more in depth.
As far as replacing a package queen, I think there is nothing wrong with doing so. If you'd like to give a specific VSH-type queen a try right off the bat, I don't see why that would be an issue. Remember that package bees are just a bunch of bees and a queen dumped in a package together, the workers aren't really attached to that queen yet at all, which is why supersedures after installing a package are so common. Perhaps just replace the queen in the package with a queen of your choice, or let them get going and then make a split and put the preferred queen in the stronger hive and the non VSH queen in the weaker split and just see what happens. There's ultimately a lot of variations on it, but if you are inclined to try a VSH breed of queen, I don't see why introducing her to a package or a small hive would be an issue.