Yes...for sure.
I've never seen one..They are aloy...The new Werner adjustable would be a far better option IMO.
Forget about adjustable..Just get a good carbon paddle if you can afford it..The Naish carbon is nice..and a nice price.
Where are you..My mate has a new Carbon C4 paddle he's willing to sell at a good price.
I have made my own adjustable Naish alloy paddle..It works well but it's pretty heavy..and it sounds a bit like a flute when the wind blows across the holes..

DJ