I would just keep plugging away, doing the next thing, slowly and steadily. Forget about grade levels and being 'behind' - especially considering the ages of your kids right now. It's probably more productive to focus on the content and reestablishing routines and such, versus the more artificial things like grade levels and 'behind' (behind what???). Your plan sounds fine to me.
Also, I don't think of all that time as 'lost'. I'm sure your kids learned all kinds of real-life things during that time. Their memories - good and bad - of that time period will be so rich and valuable to them when they're older. You might be surprised what kinds of peculiar things kids treasure from their pasts. One of my grown kids recently told me she had wonderful memories of my rousing them all out of their beds early in the morning, announcing that 'Today is a work day. We're doing X, Y, and Z, and to give us some extra energy for all those chores, I've bought some ice cream, etc.' (What the kids heard .... "No school today!!!' )
Enjoy your new apartment, explore the area, and take time to recover. Start the school back slowly. Ignore those voices screaming at you and robbing you of your joy. They'll calm down once they realize you aren't taking the bait. ;)
:grouphug: