Perhaps do an ex-JW fundraiser? Perhaps a startup company? I know this stuff is WAAAY over my pay grade...
Hemopure made sense from an economic and medical viewpoint. If there was something that replaced the function of red blood cells without them being red blood cells, that would revolutionize medicine.
Doing the white blood cells thing just for JW's is... well... stupid from an economic viewpoint. However, I don't think that it would be too hard... just centrifuge the mother's milk... how much money would a hospital need to have a specific centrifuge/equipment just for JW's, specially if they are the bloodless hospitals? The bloodless hospitals might be interested to try and push this point... They already have done all sorts of things to accomodate JW's... so I don't think that with some fundraising, some explanation from the doctors, a willing person who could donate the mother's milk, plus a doctor looking for a "guinea pig"...
If you're a person who's involved heavily in blood reform for JW's... I am sure you can find a way!! I am sure the ex-JW community can find a way!!