Nice try, but no.
The Pi uses one of it's serial ports to communicate with the Bluetooth Controller chip. It sends and receives low level data and instructions to/from the chip. Unfortunately, you can't just fire data at the chip and expect it to communicate it to another device over Bluetooth.
It should be possible to establish a connection over Bluetooth to another device using the Linux Bluetooth software on the Pi, but it is something I have never done. Perhaps someone with Bluetooth knowledge (Douglas6?) might be able to show you how.