Bridge Plugin supports MVAM and cloaking maps that you can have be blue - it requires altering an individual bridge's plugin and also having textures to support the new maps.
I don't know what the code is for having cloaking maps activate on a bridge - the readme for Bridge Plugin says that the support is there but I've never seen an example of a bridge that uses them so I'm afraid I don't know anything about how to get them in. The Prometheus bridge uses MVAM maps - if you separate the ship you'll notice it has blue alert lighting.