Does anyone know if these are supported under NetBSD, or how hard
 	support would be?

 	On NetBSD 2.0_STABLE it is reported as:

uhidev1 at uhub1 port 2 configuration 1 interface 0
uhidev1: SemiTech Semiconductor USB to Serial, rev 1.00/0.00, addr 3, iclass 3/0
uhid0 at uhidev1: input=8, output=8, feature=5


-- 
 			   David Brownlee -- abs@absd.org