Good luck with your locksmith hunt. I've not been able to find one in our area, and we have some damn fine locksmiths. Sure they can make the Thule keys (thats what the cylinders are on the LR bars), but shoot, you can by a set of 2 for like $7. online.
If you find a locksmith consider the cost. Land Rover doesn't list the keys, and even states it in Microcat that they only come w/ the handle (KNW500010), It is held on with a roll pin that takes some concentration to remove. Cost of handle w/ keys, about $20.00.
Cheers!
Just thought of this, if you know the key code, (stamped on lock,) you could get lucky, and the dealer-supplied handle might be the same, no need to install, just use the keys.
Cheers - still!