Notify all players that a specific player has looked at one of any opponent's pieces?

Module Design
1

I couldn’t find anything on this particular process, so here goes. I am “vassalizing” a WWI Reconnaissance game called “Drachen”. One of the features of the game is the ability for your opponent to possibly look at one of your pieces (and vice versa) without you knowing which block or where that block is. Any thoughts on how to make this work?

2

Nothing? No ideas?

3

If it has to be limited to only one piece, there’s really no way to do that securely with V3.