It's been my experience when you try to "Combine" products the ending result is usually very crappy.
I wouldn't pay $30+ for a transmitter, I've usually paid ~$10 for mine (paid 3 bucks for one that was on clearance at checker auto, only has 4 stations to use
)
I found that I prefer my phone sit sideways with the keyboard open for using google maps or watching videos. I actually used my psp car stand that actually held it perfectly sideways, then to take it out, I simply closed the phone instead of doing some sort of unlatching.