If the board isn't seriously fragmented (broken in half is bad enough! but could be recoverable) it might be possible to join the halves together with epoxy etc, and then solder-bridge some solid copper conductors across the board traces in order to re-establish the circuit paths. At least that would get you going initially. Using any other crossover of different design (different "Q" &/or turnover points) will definitely change the sound, possibly for better but very probably will not sound "original" as the maker had built them. If a replacement crossover is unavailable, perhaps you could make or have a new board made for you, & then re-use the original components. Rewiring is again going to change the speakers' voicing; maybe for the better but again very probably will not sound "original". No easy answers here if an identical replacement is unavailable.
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