display certain hidden attributes

[ORgrown]

Contractor is using ACAD2000. I'm using ACAD2008
I need him to be able to "turn on" a certain hidden attribute in one block for a specific purpose.
The block normally has 1 displayed attribute and 2 hidden attributes. The drawing will ultimately have say a hundred different blocks, all with their own displayed and hidden attributes. I need a specialized drawing that will have the ability for one of those blocks to display one of its hidden attributes (rotated and moved to be readable).
Is there a way to only turn on the hidden attributes for one block of many and only one hidden attribute of several hidden? That is, without redefining the block...
I want only one drawing at the project's end--and only standard blocks used. As phase 1 is completed, I will have my attribute displayed. When job is done, I will have the original block with that attribute hidden.
Thank you for your help.

[CarlB]

I believe using Lisp you can modify attributes (including visibility) of block inserts without changing the block definitiion & thus affecting all inserts of that block. If really true (haven't tested), you'd just ned to run the lisp routine to turn on/off the visibility.

You could also redefine the block (could be with Lisp) and put the attribute on a separate layer, then its visibility could be controlled by turning layer on/off.