You're welcome,
ah, 2-2-1 does change things a bit. Here's what I'd do: if you get them foiled and hit the oven, the oven ride won't change anything, just run the same temps as you planned on for the second stage (monitor the oven rack temp with your probe if you can, as most ovens don't run exactly on the set temp). When you're ready to remove from the foil for open grate to finish, place them on a smoker grate (or some other form of open grate if the smoker grate is too large to fit in the "O")) to set over a large baking pan. This will simulate the open grate of your smoker, catch drippings, and allow for a somewhat reduced humidity for the ribs to reset the bark.
Note that most ovens don't ventilate nearly as much as some smokers, so the humidity during the open grate time may be a bit higher than you're accustomed to. Also, having the baking pan under the ribs (ribs elevated from the pan by the grate) can slightly increase the humidity during what would be the final stage.To compensate for this, you may want to reduce your foiled time by 25% or so (~30 minutes), then add this amount to your open grate bark-setting time. When setting the bark, you want lower humidity, so do what you can to achieve this. If you can't get the optimum conditions during simulation in the oven, you can make changes elsewhere in the stages of the 2-2-1.
Good luck!
Eric