Re:
As jimo746 said and highlighted in the link, you can easily do the conversion to V-Brake if you already have a Dog Collar.
Picture from link:
The fugly method is one of these:
..... which I ditched, and temporarily made my own from a rear light bracket and a cable adjuster like this:
..... until I bought the later version of the Kona Dog Collar like this:
Pip.