A path to 18?

[dfrecore]

if I understand the question, you'd like to double dip grad credits to serve two purposes:  AOS in your undergrad degree and also 18 graduate-level credits for teaching.  I think this will backfire.  I'm not 100% sure that all schools do what TESU and allow grad credit to come in as upper level undergrad, but if they do, I worry that it will be coded undergrad on your transcript.

You need a masters IN the subject or a masters in ANY subject +18.  So, you still need the master's one way or another.

I don't think so - I think OP is very close to finishing the BA and is now looking at Grad credits.