Unless it's a motorway-style roundabout with many multiple lanes and high velocity traffic, I much prefer to "pretend to be a car" when I cycle through roundabouts. The busiest roundabout I regularly cycle through has 2 lanes and 6 roads intersect at it. I can't imagine wanting to use it if I had to operate outside the basic rules of roundabouts.

Something like this?

https://www.youtube.com/watch?v=FR5l48_h5Eo

Mode separation for motor, bicycle, and foot traffic; all traffic crosses as close to 90 degrees as possible (for visibility reasons); priority markings on pavement; speed bump on one of the entrances to slow traffic; and a lot more features I couldn't tell you about.

( I sometimes watch https://www.youtube.com/c/NotJustBikes/ , but I'm no traffic expert )

This is incorrect. To a rounding error all the roundabouts I have encountered (in the Netherlands, where I live) have the cycle lane follow the car lane, and give cyclists right-of-way over the cars. You'll occasionally see one where the cycle lane is separated from the roundabout, but I only know of one from the top of my head.