I think what people mean by supervision is that they go to the doctor before, during and after. Most doctors are not educated enough on fasting/nutrition and will recommend against it. I’m not sure what medication you’re taking but it could certainly be effected by the fast.
Intensive Dietary Management in Canada has an online program where they can coach you. Not sure what it costs but I think they have a cheap month to month option if you wanted to try one fast with some pro support. Let me see if I can find the link…
EDIT: https://idmprogram.com/membership/ It’s 39$ a month. Not sure this is what you really want but it exists at least. I’ve never bought anything from these guys but I have interacted with some of their staff on social media here and there.