Update

I finally found a Becker 1492 or 1692 CD changer emulation adapter that works and is reasonably priced.

BlitzSafe MB/AUX DMX V1.B does the job nicely.

It has a pair of RCA inputs and the connector that fits into the C port on the back of the radio.

The Parrot has line level outputs, I just had to solder a pair of RCA plugs on the wires. The BltzSafe box is compact and fits well behind the phone head unit.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech