I would skip the delta, and earn your degree. You will never look back and it will make you immensely more qualified if you have a real degree certificate and transcripts, than most of the khao san road fakers in Asia.
Scrap the delta, go back to university, get a degree....
Hi, I'm an English teacher who's been teaching in HCMC for 2 years. I have a CELTA and was considering doing a DELTA. However I don't have a degree. Research tells me that the DELTA is not the equivalent of a BA and all the best jobs (and with schools that check if you have the correct qualifications unlike the one I work for now) require a degree. I want a career in ELT which the possibility of progress and promotion in a good school. Any degree course would take longer and cost more than a DELTA, however is it pointless doing a DELTA if I don't have a degree?