take a look at how the Galaxy Bridge Advanced script is setup...
the section
'Maps':{
'CurrentMaps': {'g_imp_pannels-state01': "g_imp_pannels-state01", "Map 13" : "Map 13", "Map 5" : "Map 5", "g_imp_redbars" : "g_imp_redbars"},
'GreenMaps':{'g_imp_pannels-state01': 'data/Models/Sets/Galaxy/g_imp_pannels-state01.tga',
'g_imp_redbars': 'data/Models/Sets/Galaxy/g_imp_redbars_unlit.tga',
'Map 5' : 'data/Models/Sets/DBridge/High/Map 5.tga',
'Map 13' : 'data/Models/Sets/DBridge/High/Map 13.tga',
'Map 27': 'data/Models/Sets/DBridge/High/Map 27.tga'},
'YellowMaps':{'g_imp_pannels-state01': 'data/Models/Sets/Galaxy/g_imp_pannels-state02.tga',
'g_imp_redbars': 'data/Models/Sets/Galaxy/g_imp_redbars_unlit.tga',
'Map 5' : 'data/Models/Sets/DBridge/High/Map 5.tga',
'Map 13' : 'data/Models/Sets/DBridge/High/Map 13.tga',
'Map 27': 'data/Models/Sets/DBridge/High/Map 27.tga'},
'RedMaps':{'g_imp_pannels-state01': [1, {1: 'data/Models/Sets/Galaxy/g_imp_pannels-state03.tga', 2: 'data/Models/Sets/Galaxy/black.tga',}],
'g_imp_redbars': [1, {1: 'data/Models/Sets/Galaxy/g_imp_redbars.tga', 2: 'data/Models/Sets/Galaxy/g_imp_redbars_unlit.tga',}],
'Map 5' : 'data/Models/Sets/DBridge/High/Map 5r.tga',
'Map 13' : 'data/Models/Sets/DBridge/High/Map 13r.tga',
'Map 27': [1, {1: 'data/Models/Sets/DBridge/High/Map 27.tga', 2: 'data/Models/Sets/DBridge/High/Map 27r.tga',}]},
'MVAMMaps':{'g_imp_pannels-state01': [1, {1: 'data/Models/Sets/Galaxy/g_imp_pannels-state04.tga', 2: 'data/Models/Sets/Galaxy/black.tga',}],
'g_imp_redbars': [1, {1: 'data/Models/Sets/Galaxy/g_imp_bluebars.tga', 2: 'data/Models/Sets/Galaxy/g_imp_redbars_unlit.tga',}],
'Map 5' : 'data/Models/Sets/DBridge/High/Map 5b.tga',
'Map 13' : 'data/Models/Sets/DBridge/High/Map 13b.tga',
'Map 27': [1, {1: 'data/Models/Sets/DBridge/High/Map 27.tga', 2: 'data/Models/Sets/DBridge/High/Map 27b.tga',}]},
'NormalMaps':{'g_imp_redbars': 'data/Models/Sets/Galaxy/g_imp_redbars_unlit.tga'},
},
is where it is... if you follow that example, and tinker around a bit, youll prolly be able to sort it...
personally, ive never much dabbled into texture swapping in bridges, but thats where to begin...
you may want to also ask at BCC's Bridge Modding forum...