Just stay where you are and get your CFI-A.

You'll need access to a complex single (172RG) or maybe you can use a twin and do your initial in that (that's what I did).

FOI + flight instructor airplane written tests = $300

You'll need maybe 8 hours or so in the airplane. You just need to be able to fly maneuvers to a commercial standard from the right seat.

IMHO, the CFI schools don't teach you anything. It's all self study. You can find lesson plans online but I suggest you create your own for each topic of the PTS. Know everything about part 61, 91, and endorsements. You are being judged on your ability to teach not necessarily memorizing everything. Also, some inspectors are heavy on the FOI stuff.

Take your checkride with FAA inspector at nearest FSDO = FREE

Find a good 2yr CFI who can sign you off. Pay for 20hrs instruction (8-10 in airplane and rest ground school) $900-1000

You should be able to knock this all out for <$3000