In reply to HeMa:
+1. Having had Naxos, I’d not be spending any more money on accessories for them that could be saved towards replacements from an alternative manufacturer. My pair broke, irreparably, at the outset of a trip. They weren’t very good to begin with! Several better frame-type touring bindings around these days, not to mention pin-type.
however, if you’re really committed to them, good luck with the ski-crampon search