Need help finding cranks

I just bought a used KH 24 MUNI and I need a set of cranks for it. It has a 8 spline bmx style spindle. I would like to find a set of 150s, everything i find now says isis drive. Help please.

Chances are unless you really luck out it would be cheeper/easier to just replace the hub with the cranks.

doe anyone know if the old KH 8-spline was the same as Shimano Octalink? completely proprietary?