Well, you're both completely out of luck and in luck... Changing an attribute value does not affect parameter values or other block properties. That's just the way it is. It is a one-way street, parameters can affect attributes, but attributes cannot affect parameters. You're out of luck on that.
However, you're in luck that changing the block position can automatically change the attribute value through the use of a field. You're also in luck that you can select the block basepoint and put it where ever you like by typing in the coordinates. The end result is the same effort for the same result.
