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Yes, I've looked into this a bit, and it's disappointing. Based on the updated understanding of the task, here are some new questions.
1) Are the spells learned in Tomes and Arcane Knowledge listed somewhere? Or can we not influence this.
2) Since I started adding new heroes, I encountered a problem with their availability. Because it turns out that they were not "Unlocked" on previously created and Original maps, so I cannot select or hire them in the tavern.
The question is, is there a way to influence these settings globally and/or is there a way to change the "default" settings for hero access for maps?
2) Extract the maps from the mod containing heroes from campaigns; the restriction has been removed, and the heroes that are listed in random groups and do not have the "campaign" tag are available.