Llywelyn said:
I'd never seen anything that said the nations needed to be the preselected ones - is that right?
The file that has to be modified to include the calls to the strategy descriptions is "1419 - The Grand Campaign.eug" within the scenarios folder. This file only contains the countries that are shown at the initial screen and are tracked for the graphs, and those are already as many as practically feasible.
So it looks like Garbon is right. However, if you select a different country from the list, it's difficulty, economy, diplomacy and military are also displayed as colored dots. I don't know where that information is stored, but it is theoretically possible that wherever it is, the call to their strategies could be inserted there.
The matter should be researched by someone with better hunting skills than myself.
For the moment, I will submit the strategies for two countries in the list, ARG and CAS, together with the needed modifications in "1419 - The Grand Campaign.eug" with the rest of the package for the reworked Union of Spain once it is done.