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As mentioned before, such a post-canon, or, simply put, a "non-canon," will have little impact on the events of the Campaigns, as too much time has passed.
I myself went through the scenarios in Warlords a year ago, edited the names of the Campaigns in the loading screens, the starting armies of the heroes, and also added the ability to transfer heroes between Campaigns (for example, transferring Zephyra from the "Mage" Campaign to "Escape from the Labyrinth").
The Community for the NVS mod on VK is blocked, so it is still unknown what it is. Probably something only for the chosen few.
Of course, if it is planned to add new mini-elements to the missions, each of them will have to be opened in the editor. A few years ago, I did this by creating multiplayer versions from the story maps (although, for some unknown reason, the neutrals grew like mushrooms there).
P.S. I didn't mean to offend anyone with my attitude towards Heroes 6 or 7; everyone has their own preferences. Some people enjoy self-satisfaction with a bottle, while others love Heroes 6. I hope that my mod, if it is ever made, will please the fans, as its goal is simply to make people happy.
Added 5 minutes later
In fact, if we are being extremely strict about the canon, then everything ended with the third Heroes game and the "Chronicles." After that, it's all free thinking... But we came to love Ashan in the fifth game. So let's promote an alternative reality