Reclass and reenlist - 35T?

Keep in mind that DIA is backlogged 18 months ajudicating clearances. There will be more waiting, and at least a CI polygraph, if you need SCI access later.

It’s a good move, though. IC guys make big bucks after retirement.

You can get a class seat once you have an interim. That may take 6-9 months alone. You can attend with an interim, but not hold the MOS until you have a TS. While you wait, you will be a holdover. If your TS is denied you may appeal the decision. If your appeal is denied, or the process takes too long, you are reclassed. That's really only an issue for IET students. By the time you arrive at school your TS investigation should be nearly complete. If you submitted your TS today, you probably wouldn't arrive at school for 12-18 months from today.
You'll be reclassed back to 11B if you don't earn the MOS. if you earn the MOS and lose your clearance later, you'll be reclassed to whatever the Army needs.

I sent you an email and will get you in contact with a few guys who can answer your questions for you.