I have done what you are thinking about for over 4 years, and I'm convinced that repackaging, then vacuum-sealing meal portions is the way to go for what you want to do.
There are several considerations that should be mentioned here:
1) If there is any air in your food Ziploc bag, things will go goofy when you fly, or even when you climb 2-5000' above the elevation where you first packed it. Vacuum sealing eliminates this. Mountain House Pro Packs are already vacuum-sealed, with zero air inside (plus it has the oxygen inhibitor packet, which you can also buy at Packit Gourmet). MH's regular meals have a lot of air in the bag. Bags with air inside them take up a goodly amount of pack space, compared to vacuum-sealed bags.
2) Bag weights: 1 quart Ziploc freezer bag=.20 oz., 1/2 of a 1-qt. vacuum bag (~1 meal serving)=.20 oz., clean Mountain House zip bag=.55 oz. The Ziploc and the MH bags can be re-used on the trail, having the zip capability. The used vacuum-sealed bag is pretty limited as to what it can do for you after you open it. I sometimes carry one clean MH zip bag, for use as a fairly efficient freezer bag cooking system. I will clean it after use, in case I need it again. It makes a somewhat heavy trash bag as well.
3) I'm not very excited about keeping food in a Ziploc for up to 35 days, as I'm fairly certain that things would get a bit musty after awhile. Those bags don't really hold a perfect seal. Vacuum sealed bags pretty much do. When I hike Glacier or Yellowstone, I always vacuum seal every meal, including each day's trail snacks. This keeps the food odors pretty much at bay, especially when used in conjunction with an OPsack bag.
4) What I like about buying MH and Harmony House ingredients in bulk, and then repackaging things, is that I can create my own concoctions, add my own spices, and thereby control the ingredients, taste, volume, and, to some degree, the salt and fat.
Sarah has a wealth of knowledge regarding recipes and FBC techniques. Hit her up with questions, or check out her websites. She's a good lady and very willing to help.