If your current job is that flexible with your schedule, can’t you just take like one (or two) course per quarter or semester and continue to work full time?

I managed to do that when I went back to school to finish my undergrad. I was able to take two courses per quarter. One online class and one in person. The general ed requirement classes I could usually find ones the university offered online. For my major area they required you take classes in person. So I split it up that way.