Wow, I got the shifters already - thanks for a very speedy delivery!
They appear to be in very good condition and I think I will be able to reuse most of the cabling. (One cable is a bit frayed so I will have to see if enough is left after chopping the end off.)
I'll upgrade my Basso to 10-speed at some point and report on that in the fettling thread though I might completely wear out the current 9-speed drivetrain first. I don't want to put nice new/newish 10-speed parts on the bike immediately before the winter if I can help it.