I would love to invite a mentor into a pythonanywhere console, or a pythontutor session. However, I tend to agree that without credentialing, it's hard to pony up dough for something like this. I find most people who answer student questions just like answering student questions.
Ah – gotcha. It's interesting: We do get asked about the qualifications of the mentors by students before they start the class. But degrees and accreditation rarely matter.
What we've learned is that people want to be taught by those with experience – just like you want to be mentored by a co-worker with a lot of experience.
Virtually all of our students have full-time jobs, so perhaps this insight applies more to our market than others.
Also note that most education for adults advertises the _real world_ experience and prominence of their professors, rather than from where they received a degree.