Is it possible to bypass the FEDREC promotion process if deployed and holding a position of a higher rank?

Your Chain has the ability to give you a vacancy promotion. My BDE & BN CDRs wanted to do that for me when I was in your position. G1 incorrectly came back said, yes/no/yes/well/hold 1/no/maybe/etc. Your BN CDR has that authority to pin CPT on provided 1) you are in an O3 slot; 2) you have the time in grade; 3) if your name is not before the board or is pending the board (the later you withdrawal from the board). If your BN CDR does not wish to give you a vacancy promotion, sit and wait. Wait some more. Then wait again because CPT's lists take longer than the MOB processing lines.

A friend was given a vacancy promotion downrange. Unlike frocking, this is not a temporary promotion. You only get one vacancy in your career.

If you received state orders for CPT - you are roughly 9months out - and it will likely take 9 months for you to backdoor anything else. Just ride it out - I know this time sucks - but it will pass.

No. I've been deployed since June 2018 (state order June 28) and still waiting on fed rec.