Note for those attempting this: on my 250mm FE lens the winding cam has a spring attached to it that seems to release when you remove the rear bayonet plate. You'll likely require a spanner to remove the rear lens assembly to properly reattach said spring, so ensure you have the correct tools on hand (or can wait for them to arrive without the use of your lens). If reassembled without attaching the spring properly it can jam up the cameras, so exercise caution. I was able to get the lens off the camera after some fiddling but be careful -- on the 201F it seems to attempt to trip the lens and then "give up" after waiting a period or upon removal of the battery and reinstallation. Upon completion of a repair procedure it's probably best to attempt to trip and wind the lens off of the camera before reattaching.
FYI for those interested in FE lenses it seems that the parts on various FE lenses are in fact interchangable. According to the service manual Hasselblad F => FE upgrade kits included a standard set of electronics (in addition to the lens-specific encoder rings and other parts), and the upgrade kits allowed the installer to configure the electronic boards by bridging the solder pads to set the maximum aperture. This likely means it's possible to swap the boards between lenses. They don't seem exorbitantly complex in and of themselves so it may be possible to fabricate a replacement PCB. Has me curious :)