I am guessing that the "plastic" lever that Bill mentioned above was made 
through a rapid prototyping method which yields similar results to a 3D print, 
but is a different process.
You know I love my silver shifters and friction is fine, but I am also OK with 
indexing, in fact the old Deore XT thumb shifters were about as perfect as 
could be. When I am touring or just cruising about town if it takes  a second 
to coax the chain into gear no biggie, but out on the trail many times you need 
to shift quickly & it really needs to be pretty much brainless. That being the 
case, something that can easily be done. Why not? My main issue with indexing 
comes from the move away from simple thumb shifters to "rapid fire" trigger 
shifters.
In '93 I got some Mavic wishbone shifters, they had little interchangable disks 
in them that corresponded to different index systems. Just use the disc, that 
supported your system, my bike still has those shifters & they still work 
great! Not sure why Dia Comp (or Sun Race) could not come up with a ratchet 
shifter that actually indexes using a similar concept!?

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