winscreencap: Windows lock screen

When locking screen on Windows:

• gdiscreencapsrc pauses,
• dx9screencapsrc and dxgiscreencapsrc break the pipeline.

I want to make a WebRTC-based remote desktop for Windows. For this I need to capture the lock screen, too. Could some of these plugins be adapted for this?

If not, but somebody knows a screen capture technique that would enable this – I would be happy to contribute.