The open university so far is doable for me while working full time. I study Part-Time, BSc at this pace takes 6 years.
Full Bsc Degree costs around 20k€ I believe. Sometimes the money I paid for the module is biggest motivation to do the work needed, sometimes I enjoy the courses. First year (cyber) did take very few hours with my current work experience. I am in second (full time equivalent-) year now and it's getting a bit more interesting, but still nowhere near the hours I expected to put.
Their math materials are awesome - I wish I would have taken maths over cyber. (But would have much less of a life because I would need to put much more effort)
Edit: I should add maybe: I am self taught working in a DevOps position and am older than you. I left school after 10 years, and I don't have the high school requirements to study in most universities in Europe.