Bumpkin,
all the bits are freely available, if you're not into soldering the ends onto a universal (eg Venhill) choke cable you probably know someone who can.
Dell'Orto UK are very good with the parts, here's the kit for the carburettor itself, part number 53006:
https://www.dellorto.co.uk/shop/dellort ... oke-kit-2/
As for the cable, you MIGHT be able to get a suitable one ready made from a KTM dealer as they fitted this type of carb to some of their 4 stroke bikes in the 90's. A quick check on ebay shows the sort of thing you'll need to fit with an old-style Amal or Doherty choke lever, hopefully you can find one of these a bit nearer home!
http://www.ebay.co.uk/itm/1991-KTM-600- ... SwDN1UTc6s
Somewhere selling spares for 70's/80's Ducatis and Moto Guzzis could also help, eg
http://ducatipaddy.com
Fitting the conversion is straightforward once you have the cable sorted.
A.