Heat Transferal Unit:
Cost: 100CE-150CE

The Heat Transferal Unit (henceforth referred to as "H.T.U") can be attached to an item of the players choosing, whereupon said item will receive heat gained in the Clockworks/Missions without needing to be equipped by the player. The H.T.U would last around 7 days (unless the player chooses to remove it earlier than that), and carries across when the parent item is upgraded (i.e. If a 4-star item with a H.T.U attached is upgraded to 5-star, the H.T.U will still be in effect on it)

For the sake of economics attaching the H.T.U should also probably bind the item to the player, otherwise 4-5 star gear would probably plummet in value due to lack of unbinding needed.
.
.
Heat Slot Token (alt. concept):
Cost: 350CE

Upgrades a Weapon slot into a Heat Slot. Heat Slots can have Armour and Shields equipped in them to gain heat (though there is no statistical benefit to doing so) in addition to working just like a regular Weapon Slots. They last for 30 days just like a regular Weapon Token.

If both Weapon slots already have tokens, then using a Heat Slot Token will "upgrade" one of the Weapon Tokens into a Heat Slot token, but with the weapon tokens timer being put "on hold" until the Heat Slot Token is done.

Example: When a Weapon Slot with 28 days left is upgraded with a Heat Slot token , the upgraded slot will spend 30 days as a Heat Slot, then go back to the 28 day Weapon Slot.