In researching a couple of option to get to a rifle I want (WSSM based), I've read here that it is fairly easy and inexpensive to have a large shank barrel turned to small shank. What is the cost?

Also, there is a supplier of the barrel I want, but they only sell them in large shank. If one was to go with a Large shank action is about the only "loss" the ability to use inexpensive take off barrel?

Thanks in advance.