Installed the same backup camera as the DIY.
OP - Thank you for taking the time to post this option. I love the backup camera!!
For those attempting this, I would recommend unplugging the battery before messing with the NAV harness. I blew a fuse while installing mine when wires were flapping around.
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2009 335xi Le Mans Blue; JB4 - Map 5; flashed, VSRF DPs, VSRF Intercooler, transmission flash, VSRF chargepipe, LED interior, Angel Eyes, Glossy Black Grill, spolier, Rear Fog Light Mod, backup camera mod, 2020 Nav. Maps;