I don't have a Zebralight yet BUT, this is exactly my plan for long running, high quality lighting for close work.
The numbers for the H51Fc AA Floody High CRI headlamp are really good at mid levels, M1 is posted as 27 lumens for 10.5 hours with M2 at 13 lumens for 26 hours! Double that up with two lamps and I believe that'll be plenty for needlework or what have you. I'm looking forward to working out an over under band system to let the lights sit close together with stereo light coming out over my eyes, or to fix the lights in the bands by their base caps and have a wider dual light source, should do good things for eliminating shadows with close fine work.
Very excited, wish I had the extra 124$ right now, maybe after Christmas gifts are taken care of... working in the dark will never be the same.