[1.10.2] Bed Like Item

[LogicTechCorp]

I have an item that acts like a bed. When shift right clicked, it saves the players bed location and current location. When the player dies with the item, they spawn at where they shift right clicked the item. When they die without the item they spawn at their bed location, if they do not have a bed, they spawn at the Overworld's spawn point. This works perfectly when used in the Overworld but when used in The Nether, The End, and Modded Dimensions it spawns the player in the Overworld.

 

How would I get the dimension of the players bed/spawn point?

How do I change the players spawn dimension?