Don't worry about the technology, worry about the private certificate first.. You don't need any technology to get that and when you return from Minden, you'll be in the final stretch. Concentrate on the flying. (If you can't resist, buy Condor and work it out there before introducing a distraction in the cockpit)

My club teaches primary in the 2-33, then you move on to the ASK-21. As a mostly ASK-21 pilot these days, I often worry that I will 'forget' the performance difference between the two when I fly the 2-33. I haven't found it to be an issue, and doubt you will, either. Just heed the advice not to get downwind from the airport in it (it simply doesn't penetrate well) and you'll be fine.

Taking lessons in Minden in the ASK-21 will prepare you for your club's Grob when you are ready and the transition will likely be a non-issue. Going back to learning in the 2-33 isn't going to 'undo' anything you learned in the ASK-21 - both require your brain to be engaged prior to takeoff.

Welcome back and have a blast!