haha, as intriguingly stress-inducing as the JB weld project sounds, i'm very happy to say that papajohn has hooked me up with some spare parts, so the level of difficulty in getting the machine back to work has been greatly reduced.
thanks and props to papajohn!
(though once i've replaced the plugged jack, i'm certain i'll someday try to remove the broken tip...will post here if the JB weld - or other epoxy-related rescue is successful...or not)