Changing the map of an existing campaign

[Xrhstakos98]

Greetings, as per the headline, I would like to know if it is possible to change the map of an already existing campaign. In particular, the RAF Battle of Britain campaign, which normally uses a fictional map of Finland simulating the Channel. The Channel map exists (as a mod of course), so is it doable or even worth the time to swap maps? 

[Lowengrin]

Not without creating new .rds .srd and .rls files as well as tweaking some others.

There is a document laying out the process: https://forum.jg1.org/topic/7662-lonestars-create-an-external-dcg-campaign-pdf/

It's old, but a still remarkably accurate document.  There have been some new timetable commands added to DCG since it was written, but they are very specific and not necessary.