Bypassing the maximum number of courses (30) with activities

I am planning a trip that has 42+ segments. The F5 being limited to 30 courses, I was wondering if it is possible to save/edit a course as an activity that would then be navigated?

I am able to push .FIT from my Connect to the F5. Unfortunately I can't figure out how to trick Garmin into thinking that a converted gpx/kml file is an activity. 

Pointers greatly appreciated.