I get that problem. By the way, the Sakura-IT guys are using SVN + GIT together somehow, they wrote about it in the Open Source thread I started elsewhere. This is probably something worth looking at.
Also, are you aware of this project, MacRelix? http://www.macrelix.org/
This is a UNIX environment for classic MacOS, including 68K. It includes a (partial, but working) port of git. Source is of course available, maybe we could look at this as a solution.