Combat Change/Reversion Using New Weapon(s)

A two handed blade for the current mechanics, more powerful swings but at the cost of speed.
A single handed blade for the old mechanics, faster swings but weaker.

Doesn't necessarily have to be either of those items, of course, but a new weapon to either put the old or new combat mechanics on would be a viable fix.

Think of a rogue's fighting style vs a paladin's.