What a pity! These are some of the most interesting designs that rOtring ever produced 
For FC, it might be fun tracking down the TK-9555 and siblings like how @DarkwingDuck has done. Or maybe check out a 9800SG, Microlette 0.5… Also worth checking out the DS75 automatic and Aviator DC double knock.
Staedtler’s REG and 925 95 are actually made in Japan, as are their RETRO series of double-knocks. Maybe check out the old Marsmicro 770 and Marstechno 770?
A couple more that come to mind… Montblanc Carrera pencil, Pelikan Signum series, maybe the Diplomat Aero?