There is guy on e-bay offering a laser cut short kit for the Royal Zero.
http://www.ebay.com/itm/ROYAL-MARUTA...item43aa1b0038
I e-mailed him and he told me that he plans to eventually have most of the Royal/Maratuka line available.
I don't have any idea how the quality is, but price seems reasonable. He relsits every few days.