Part of the problem with only replacing the part in the picture is that the wiper arms are part of the rest of the air flow meter.
If the parts were readily available I'd fix it that way it a heart beat. Calibration would be no problem as far as I'm concerned. They even told us (hush-hush) in Bosch training how to pop the cap on the outside and adjust it with a little trim screw.
Bosch Master, ASE Master, L1
33 years MB technician