Ditto. My pax seat also has that grab bar, VERY well used (almost at 478,000 miles) and zero problems with it.
I just looked at mine, and I don't see a way to install one into the B-pillar itself, unless the audio and power lock wiring and courtesy light switch were removed. Those take up all the flat spots on the edge, and the inside is taken up by the seatbelt. It was just never designed for it, unlike the Transit, which offers those bars in certain markets, so all of them have the mounts.
2000 E450 dually V10 wagon