First of all, let's admit that RMXP has no dual wield aka two swords style feature, yet, I have implemented it already.
You should also now that I used CONSTANTS as a method to preset a list of skills that will require the hero to equip a combo of two specific swords and probably even an accessory before they can cast that specific skill on their foes or even their allies.
My Script does NOT provide any Custom Equipment Scene at all, guys!
Here you can take a look at the KDualWield module and the comments I left there to guide you on how to use my script.
Ruby:
# * KDualWield & Accessory Skills XP * #
# Scripter : Kyonides Arkanthes
# 2023-02-09
# * Free as in beer * #
# Force your heroes to equip specific weapons or even an accessory as well
# in order to be enabled to cast a specific skill.
# - NOTES - #
# The Weapons Order does NOT matter here!
# This script does NOT modify the Scene_Equip scene!
# Even so you can change the hero's equipment by script call or event command.
# * XP has NO Note Tags so we Need to configure the Constants Below * #