They make a version of the LiquidAUX that comes with a mount sticking out of the 12v plug. May or may not work depending on your car. I suppose technically you could use it for handsfree calling but probably wouldn't work too well with the positioning of the mic.
I looked at getting a LiquidAUX (you know they're $20 cheaper on places like Amazon right?) but reviews seemed to indicate it was cheaply made and the remote fell off a lot (and yes complaints about needing a ground loop isolator, seemingly specific to this unit, but that's only anecdotal). Curious what the OP's experience with the remote has been like.
That LiquidAUX deluxe with the mount won't work with my car, the position is different.
What's a ground loop isolator? What's it for and how would you use it?