Pathfinder has made a stainless-steel replica of USGI canteen cup with a couple of "D-rings" on top of the handle. As with the similar Swedish cook set cup, this allows user to use a stick to manipulate the cup when used over an open fire and eliminates burning one's hands on the over-heated cup handle.
Having burned my hands more than once on over-heated GI canteen cup handles, this Mod is a very useful one.
Clever and appropriately equipped folks may be able to add such "d-rings" to existing GI cup handles by spot-welding or pop-riveting brackets for them onto the handle of existing GI canteen cups. If using Pop rivets, make sure pop rivets don't preclude fully "closing/folding" the cup handle.
Vid
HEREDisclaimer: No financial interest.
ETA: Response to e-mail sent to Pathfinder indicates that there are no current plans to offer the new style canteen cup by itself.