What would they do?

[Kuruharan]

So, while Isildur was fighting his final battle he has a conversation with his son Elendur in which he says referring to the Ring:

My pride has fallen. It should go to the Keepers of the Three.
-Disaster of the Gladden Fields

My question is, what would the Three Keepers have done with the Ring once they had it? Would they have sent it immediately to Mount Doom to be destroyed or would they have held on to the Ring and tried to guard it, fearing what would happen to the works of the Three if the One were destroyed?