Hi Y and all:
The "circuit" of heel on perineum is not a key factor. The gentle pressure is, when one is ready for it, and it sounds like you have a good approach.
There is some benefit in sitting cross-legged. This has to do with opening the hips more than creating a circuit. But, as mentioned in the lessons, crossed legs are not mandatory either.
If a circuit happens later on, fine. If not, that is okay. The rising energy will take care of it as needed, and as one is able. Same thing with thumbs joining index fingers. These are effects (automatic yoga) more than causes. Are these circuit things necessary for enlightenment? Not as far as I can tell. It is much easier to make progress while comfortable. In fact, comfort in sitting practices is more of a prerequisite than any particular body position. Then we can be doing the techniques instead of being excessively distracted by the body.
Enjoy!
The guru is in you.