Hello,
I just searched the web for both of these and was unable to find anything...I found a CVI driver for the Keithley 181 on the NI website, but I doubt it would be a simple conversion with the "Convert CVI Instrument Driver" utility in LabVIEW...it certainly wouldn't hurt to try, however. Anyway, I guess about the only option you have at this point is to contact the manufacturers of those devices and see if they have any un-published drivers...perhaps they're not supported, but it's better than nothing.
Good luck in your search. Have a good day.
Sincerely,
Darren Nattinger
Applications Engineer
National Instruments