SCCM 2012 OSD with Bitlocker

Anyone know the command to during OSD to

1. Turn on Bitlocker

2. SkipHardwareTest

3. Choose TPM +PIN with PIN number

4. Save the recovery password as a text file to a network location.

NOTE: Since it is a workgroup laptop I have a GPO that gets injected before the attempt to to turn on Bitlocker to allow TPMPIN.

My current command line is

manage-bde -on C: -s -tp XXXXXXXX -rk C:

This works and the key is saved to C: as a .bek file. I have the following issues:

I do not want the key saved to C: but instead a network drive. Also the default save method is a .bek key and I need this to be saved as a .txt file like it does with MDT.

Thanks