How about two operators to get a Variable Type and a variable's Value. Example:

Get a variable's Value:
Value( Get( List("Variable Store Inventory"), 0))

I haven't thought of this before, but that would definitely be a useful thing to have.
It would be a more expressive proxy method.

I had another look at it, and unfortunately this is not possible without a massive rewrite of the variable system.
So I won't implement this.

Alternatively, you can use the variable proxy block with a little bit less flexibility.