Sorry not qualified to answer your question, but I my be thinking along the same lines. I know where to get 6mm blank overlength plain shims that I can turn to length. I know this is possible as Ive just done 16 off 7mm ones for another build. The bigger slotted one will need making though.
I have the gear to do this (i think) so I am interested in the answer. An english description of 1.4313 etc would be appreciated also, so I can ask the metal man without looking a prat
if your shiming up your valves just use a 6mm hole punch and make your shim's out of a cheap set of feeler gauge's. thats what i have done and several thosand miles later (on track days, sprints, hill climbs) still ok. iirc thats what pulsar bobby uses as well.