Go figure out the downwash velocity - there probably wouldn't be anything left on the end of the cable!
Rotorwash or downwash is a more significant issue for the V-22 than the 609 because of MGW and the disk loading.
The V-22 is more than double the MGW of the 609 and the disk loading on the V-22 is much greater factor because the prop-rotor diameter was artificially shrunk to fit on the US Navy ships in particular landing spots. This lead to a more aggressive disk loading factor, which results in a more violent downwash.