Made also small upgrade to the present wifi antenna connections for the BCM943225HBM. Did brake during last trip laptop touchscreen and lcd (felt to the floor lcd corner ahead, "very painful" replacement costs around $250-300 ...), rest of laptop survived well, so bought from warehouse cheap open box Flex 2-14 and repaired from those parts. Also i had vacant old m.2 for OS X unsuitable wireless card left. So, decided this time not cut away new wifi connectors came with new laptop, just in case that maybe in the future is good install smaller OS X compatible NGFF card. Decided cut away piece of PCB board of NGFF card with M.2 antenna connectors and make adaptor. Soldered PCIe antenna cables to that M.2 cutted board piece (make your own antenna adaptor"), also soldered U-type piece of singe conductor wire for fixation of the "adaptor". U-wire not visible on the pics, it's covered by screw head located near.
Actually i do not suggest anyone do such job by self, if you do not have special skills... if you still want make such adaptor, then you'll need for that job low power micro soldering iron, "third hand", good loupe 10x or even better, lot of patience, risk of damage the micro connectors is mainly same big as succeed... at least ideas...
