Sure I can do it. It's just a matter of finding that pair of normal looking arms, since for Square, the way Cloud looks is considered the status quo. Square modellers often reused existing pieces from old models whenever possible. See, field hands are divided into the upper-arm, forearm, and hand.
If you look closely, most of the upperarms of men without sleeves look just like Cloud's:
/ \
- ==
\_/
As do the forearms:
___
/ |
== |
\___|
The part you want to fix is the ==== (combined)
...anyway, I think I've finally found some suitable pieces and am currently trying it out.
Trouble is that little kids, women, and fat people are all in different proportion to each other, including their arms/hands. That's why the hand patch makes some models (like Scarlet and, some say, Cloud) look trippy.