Actually, I've uncock my compound CB, with an anticocking devise, the same way as my Excals. It takes a short piece of dowel or (piece of) arrow long enough to push back the anti dryfire device and be held in place by the arrow clip. Then proceed as shown on the EXCAl site. Some Ten Points, which have the forearm safety in addition to the main safety cannot be uncocked this way, however, unless one has more than 2 hands available.
I must emphasize, while it CAN be done this way, shooting an arrow is still the safest.