Certificate Automation and AS3

Hey everyone! 

At my company we have a policy that all private crypto objects must be generated on the target device and never leave it. I am creating a REST-based automation system for the LTM devices, and I am struggling to see how to achieve this using AS3. My desired workflow, from an external server running a python script to send REST commands:

1. Have the LTM generate a key and store it. This key may never leave the device.
2. On the device, create a CSR.
3. Get that CSR and read it from the script, which signs it. 
4. Upload the signed cert to the device.
5. Somehow incorporate this into or make it available for use by an AS3 declaration.

Any ideas?

Thanks!