As said above, pressure or vacuum bleeding may be the way forward.
An old method for difficult systems was to clamp the two front flexies and one rear, open the un-clamped bleed nipple and let gravity do its job, when fluid is seen to come from that wheel, bleed as normal, by two people using the pedal up, down, up, down, two or three rapid pushes then close the nipple with the pedal down, till there is no more air, clamp that one and repeat on the other rear, i.e. open the nipple then wait till fluid starts to dribble, bleed, clamp and do the same on the fronts.
With all clamps off, go around them all again and bleed as normal, to ensure there is no more air and you have a firm pedal.
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Common sense isn't a gift, it's a punishment because you have to deal with everyone who doesn't have it.
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