This is slightly off topic and only suggested for consideration. Have you considered attending
an electronics program at a civilian college?
I‘m not knocking the military education or the MOC training you‘d get in the Reserves. Civilian
education, and I‘m referring to technician/technologist level education in this thread, is more robust and thorough than the CF POET or advanced training at least in the first few years. You leave with suitable knowledge to program, perform electronic design, and troubleshoot to the component level of practically any electronic system. The CF education, primarily in the junior rank courses, focus on the basics and product specific applications.
Both provide good education, but in my opinion, the civilian education is more indepth and useful
because of the basic foundation you get.
You could take an electronic program at a civilian college and then apply to the Forces after graduating. You get a better salary and appointed to rank of Acting Corporal. Or you could join the Reserves and attend the college program at the same time.
Once again, your situation, interests, and direction will take you where you want to go. Just offering this as an idea.