The Converter Griffin does this situation. It works and does what it should.
A star deduction he gets from me simply because I did not find the design optimally. He is quite high, so that the iPhone has just enough grip in Griffin Cradle to not fall out. But he is very narrow, which is why he likes to wobble in the cradle forward and back and plugging the iPhone takes place far less comfortable. Sometimes you just need more tests is that you can clean the iPhone.
The maintenance is also not optimal. If I do not hold fast when I pull the Converter iPhone from the cradle, I ZIHE the Converter with out and that is a bit annoying.
Conclusion: As a stopgap useful but the comfort is great need of improvement.