Now I see, misunderstanding from my side.
I did consider before 2 separate vic's interconnected, somehow, one for positive, one for negative.
2 bifilars like you said, on a single core, even better, with only one transformer of which the secondary is a dual bifilar like 8-10.
or 2 bifilars like hdemartin's, with a floating wire, for each side one floating wire.
but first we (john
) must confirm the basics