V-brake / cantilever pad alternatives for carbon rims? I've found these V-brake compatible brake pads rated for carbon rims:

SwissStop RX Plus Yellow King

Trickstuff (unnamed) http://www.trickstuff.de/en/products/felgenbremsbelaege_KL.php

Ice (unnamed)
http://www.dccycles.co.uk/ice-72mm-v-brake-pads-for-carbon-wheels-53558-p.asp

Paul Components (Kool Stop-based)
https://paulcomp.com/shop/service-parts/rim-brake-pads/

They're all some combination of expensive, unattractive, and difficult to find.  

Are there any alternatives? Or some way to use standard pads with V-brake shoes (or adapt standard shoes to V-brakes)?
It turns out the best way to go about this is to buy threaded cyclocross brake shoes that take regular road pads. A few:


Avid Shorty 6 TRP 
TRP Inplace Adjust M
Jagwire Cross Pro 
Kool Stop Cross Threaded 
Clark's CP453CV
Tektro 720.12