Swapping ship picture

[Emperor's Child]

Folks, I Need some AI design / Mod advice for an unusual thing I’m trying to do in a Mod’ I’m working on (Battlefleet Gothic). My problem is that I’d like to make 2 warships of the same size that are same in all respects except for the picture. My intention is to have one picture used for ships with a certain weapon, and the standard one used for all the rest. I’m using the carrier picture for the unique picture so all standard shipsets will have it. I’ve fiddled around with AI tags but can’t find a way so far that will force the use of one ship definition (with its unique picture) over the standard one.

Has anybody done this or have any ideas?