Well, you won't get the exact ability to Dual-Wield Spiked Chains, but if the character is fine with some 'reflavoring' of the weapon (and NOT reliant on other feats or powers that wants you specifically wielding that weapon) might I suggest the Transcendant Ki Focus, a Superior Implement.
Transcendent Ki Focus
Blinking (When you hit with a teleportation attack power, you have concealment until the start of your next turn.).
Reaching (You gain +1 reach with melee attacks using a reaching implement.).
The character could then wield a different weapon, such as a Flail, that would mechanically be different but flavor/fluff could be changed. All that would be needed is obtaining Ki Focus Proficiency to take the Superior Implement Training feat.
EDIT: This does not work by RAW, as PHB3 prevents Superior Implements from ever working with Weapons (regardless of the kind). So unless the Character is also deciding to go Monk, this won't work as I previously mentioned.