Voile Splitboard Heel Lock Retrofit Kit
I got these to use with older spark Blaze bindings and had to modify the bindings to work but they held up so far. Binding mod is easy just be sure that your mod doesn't impede climbing wires or downhill mode. Boots are the limiting factor with locked heels as I find it tough to skate ski across flats in soft boots but you can still easily hockey stop and sidestep uphill. Planning to move to hard boots next season!