That's really cool honestly, I don't see the issue.
Am i misstaking you with somebody, or are you that person who keeps repeating that rolling for stats is cheating?
Bcs if you are that person ... i dont really understand your point.

Using official rule that was created first is cheating ...
But changing rule, while completely ignoring restrictions that were made there for ballance purposes and distinctive gameplay ... is perfectly fine?
How exactly do you decide wich is wich?

Monks needs some love anyways
I agree that Monks needed some boost ... many people were thinking about it, and many people come with their own solutions ...
My favourite is to give Monks extra Ki points equal to their Wisdom modifier ... it gives you necesary boost for early level, while it dont affect ballance for endgame.
and halberds should totally be monk weapons.
Its same as with Crossbows ...
They do everything just as Bow does ... but better (the only difference here is base damage) ... so what is purpose of Bow?
Same goes with Heavy Armor ... it does everything just as Medium/Light do, but beter (AC) ... so what is purpose of Medium/Light Armor?
Same goes here ... if Monk can wield Greataxe, Greatsword, or Maul ... and still have all benefits from it being Monk Weapon ... why would they ever use anything else?
I honestly don't see the point of limiting all rogues to being street urchins.
I dont think they are ... or ever were as the matter of fact. O_o