You can split map for Mapsource (and Basecamp) with Mac version of Gmaptool.
You can create a virtual sd on Mac (read the whole linked thread)
Patched BC can allow you to unlock maps with Jetmouse kg even if they have fid greater than 2200.
Between an img unlocker (gimgunlock) version for Mac is available on forum.
You can check section Indices and sticky threads for all these infos.