I don't have 1st hand experience in this case, but I would pull both the fuel pump relay(s) and the COP fuse(s) to be sure there is no fuel OR spark.
I see fuel pump and PCM are on the same fuse/relay, so that may be a no go. May have to disconnect the wiring directly. The COPs however are on their own fuse/relay.
I believe there is information from when people have done compression tests that would be useful in this case.