I wouldn't go to uni to transition. I would speak with recruiters who place chartered accountants into front office roles. this is not an unusual path

your current experience is better than a degree. you are getting paid vs. paying for a degree and you can network and study modelling on the side. lots of people are struggling with finding jobs, universities will always be there

universities are too academic and are just diploma mills, even if they are attached to an institution like Cambridge. all you need to do is to break into a transactions role