Launch Windows PE on a remote computer

We use WDS to image and reimage (refresh) computers (WDS only, no MDT).
A technician can PXE boot to WDS and essentially lite touch the image.

What is the best way to achieve this from a remote location on a PC that already runs Windows 7, without using PXE boot if we want to avoid a human visiting each machine?

• I have various methods of remotely invoking scripts/programs on a PC whether someone is logged in or not.
• We have a WIM image already to go.
• We have a custom WinPE image, which we can add any kind of scripting to get the job done.

I am thinking of the following:

• Deploy WinPE boot/source files to computer from remote location.
• Invoke script to modify BCD to modify the Boot Loader to point to the WinPE boot (Note, if this will not work directly I could potentially shrink the disk, create a new partition, copy the WinPE stuff to the partition and then modify BCD to point to that).
• Reboot and machine will boot to WinPE which will have a ZTI style script to do the imaging work.

How does this sound? Have you done it a different way? Is there already a way out there?