It will be a transition, but I believe an achievable one.
What would be your new eating hours?
Most people doing 16/8 eat noon to 8pm. That might work well with nighttime classes.
You could also stick with your 3PM eating window start time since you’re accustomed to that. Just complete your eating by class time. In essence eating a shorter window - maybe 18/6 or 20/4.
I do Omad, normally dinner. Eating a large meal before your classes every day might work too. OMAD is sort of the ultimate in flexibility. You just eat once a day - whatever time works.
Best times that work for me is 12-6pm. I’m a huge breakfast person so mornings are sometimes tough. I sometimes chew gum and drink black coffee which helps suppress my appetite. Sugar- free gum is a huge game changer . Good luck!