Here's my setup:
Stock HH huggers larksheaded to rings. Biner for easy on / off the tree - this could be a larger loop to pass the rings through, but a biner isn't a bad thing to have around - makes getting the height correct after setup easy, and for the weight I'll diet first before I worry about it.
I run the line through the rings and I do a stopper knot - but I think with Tree Dwellers method I could forgo the stopper.
I'm going to sew some straps with larger loops - it will move the stitching further away from the rings - and I'll be able to pass the rings through the loop if I want to ditch the biner.