Based on two survey marks it appears that the image offsets are:

Maxar: 2.67; -0.27
Bing: 4.36; 6.26

Luckily it's quite flat here so the error seems to be fairly constant.

I've added two calibration geometries to http://offsets.textual.ru/  which can be used with the offset plugin in JOSM and the two survey marks.