If you use ZCM Imaging, you can actually re-image a computer remotely, re-image a room, automatically apply images based upon the make/model, and many other things.
Even if you could make your planned method of requiring someone to operate a menu to download the proper bootloader for every single image restore...at that point it is not far from walking around with a BootCD/USB stick.

Using ZCM to image your devices would be far simpler.