Reply To: Locking objects on specific pages?

Yeah, that’s a hard one. One way you might do it is to have some text on those pages, and assign a particular paragraph style to it. (Even if the text is on a non-printing layer.) Then you could use a script to look for pages with that paragraph style and apply the script to it. For example, this was written a while ago:

Applying a master based on paragraph style

Or you could do it with a commercial script, probably even more efficiently, such as MasterMatic:

Mastermatic