("Trader's Honor")

It seems this map is designed so that you spend about four months building up your army and then, with significant losses, defeat the enemy's forces. So, would it make sense to edit it for a faster playthrough?

I'll add it to my future plans and try to complete it. A quick review in the editor doesn't allow me to assess much. At first glance, we have 4 Dungeons and a Rampart at our starting location. If the enemies don't overwhelm us quickly, we can build an army. I checked: the author has banned Berserk and the Tome of Fire Magic, so it won't be easy.
Is it worth editing it "for myself"? If you can't complete it, but you want to, there are 2 options:
a) start over on a lower difficulty;
b) edit the map, strengthening yourself and/or weakening the enemies.

The map can be completed in approximately 3 minutes (if you consider killing the hero to be completing it).

Have you already completed it in 3 minutes, or have you planned a route in the editor that takes 3 minutes? :)
By the way, I recently saw a modified version of "Paragon" for beginners who still want to say, "I completed it too!" It features a radically altered version where the hero has all 8 dwellings and legions of Azure Dragons in their army at the start (and, it seems, all 4 Tomes of Magic). "Play and don't deny yourself anything!" :D