Excel VBA SVN Client / Integration
TortoiseSVN integrates well with the Windows File Explorer and allows for the integration of an external diff tool (like Beyond Compare.
Beyond Compare has a specific plugin for Visual Basic code that appears to ignore case for 'unimportant text', meaning anything not in quotes.
I don't think this will solve the SVN churn issue, however. I don't believe that SVN uses the external diff program to decide whether a file has changed prior to committing, and I don't know of any way to override this behavior.