I don't think you would need to take the time to draw Maximuuus. Nezix did probably what you have in mind, in
a thread dedicated to the intuitiveness of the high-ground rule and reality (or lack of it) that it captures/models.
I am of the opinion that high ground in a skirmish battle (like in BG3) should realistically provide no benefit what so ever, except improved range. But that thread is probably not the best place to discuss it (
that one would be better).
On a different note, Hotfix 10 introduced more tweaks to the random number generation ... as I mentioned there, this here thread suggests (and quite relevantly imo) that perhaps BG3 could just change the base rules instead.
