Your DH's job sounds absolutely shit - he should definitely look for another one.
However I suspect he's embellishing / exaggerating / lying...
Given his attitude to not giving up his hobby time to facilitate you returning to work, I'd bet large amounts that his work is not as inflexible as he says, he just doesn't want it to be flexible.
I've worked with men who've openly admitted to staying at work until after the children are in bed to avoid childcare / parenting, and fed their wives ongoing stories about how unavoidable it is that they work til 7pm. Actually they're surfing the internet, chatting, snacking etc. around doing a desultory bit of work - a few emails or similar - whi h they could easily have finished by 5pm if they'd been motivated to work efficiently to get home to their beloved family ... Not being unfaithful or anything, but also not swamped with urgent work.
Your DH doesn't have to be such an allegedly whipped wage slave - he could find a more flexible job if this one is really as tyrannical as he claims - he just wants to stay where he is because actually it suits him.
You don't know yet what you want to do, so be pragmatic. Utilise this time when school holidays aren't a factor and you're still with your husband so don't need to pay rent anywhere.
Don't waste your time and energy on an evening course which will wind your selfish husband up because he doesn't want to parent his child, you're right a random evening course won't get you anywhere given you're already postgraduate educated.
I think you need to find a daytime job say 3 days per week which will "only" cover childcare and a little bit left over for now, and get your DC settled into a nursery or childminder so you're employed. Practice being a single parent with the benefit of not paying rent for now and get a track record back at work for your CV.
Once your child qualifies for 30 hours up the nursery or childminder to full time and study the other two days.
Use the time before that to research what you actually want to do and what qualifications you need.
Don't "throw away" the qualifications you already have - think laterally and work out how they could be advantageous in some kind of tangentially related career. Then you may well not have to start right at the bottom.
I've changed career twice but never started right at the bottom because I've linked the qualifications and experience from the previous career to the new one and negotiated starting higher up pay and responsibility scales. You need to see your existing qualifications and experience as an advantage in going into a new career, and be creative and pragmatic about how you approach choosing and starting a "nearly new" career - you needn't start right at the bottom at 40 with a masters and work history.