Update. Was able to solder this, bridging the gap of the wire breakage. Reads proper 8 ohms, bu who knows if it'll last.
Quite the mess, as I originally thought I'd tin the whole length of wire, then lay another wire across to bridge the gap and make more robust overall.
That didn't go so well. The epoxy that covers the wire just made a flux-like gooey mess. The solder would stick to the wire, but made no connection to close the circuit (maybe this portion of wire is enameled like the voice coil?)
I originally thought a hot bead of solder would melt all that junk away, but no luck. Maybe should have tried an epoxy removal method (Goo Gone), and perhaps aspirin to remove the wire enamel. It's such a thin, delicate wire, though, success never guaranteed.
Anyway, thought it worth bringing up again as I've read quite a few stories on here about receiving "working" used speakers only to find the tweeter is junked. It occurred to me that perhaps precisely this same breakage is occurring during shipping / transportation, the culprit being the weight of the wire itself going from the crossover to the tweeter. A big "perhaps", but perhaps securing the wire closer to the tweeter could mitigate.