Normally, when doing some work on an existing project, I would just go with whatever style is already established in the code base. But our team has to maintain multiple small t
I'm not aware of an existing project that would do this for you.
Have you considered writing your own? For example, the Eclipse framework does offer solid code formatting tools. Have you investigated extending one of them to do what you suggest? Detecting variables named with the pattern you mention should be fairly straightforward.
I realize it's not an ideal solution. BUT, if you have a large enough code base, it may be more cost effective than doing all the edits by hand.