Doing it with official models will likely require them to be decompiled and recompiled with the appropriate .qc and name changes. Or, perhaps you could override an existing .vtf file, but then you would not be able to use the existing one (and even if you don't need the existing one, I'm fairly certain this is not good mapping practice).
If you don't use the other texture you can place a file that has the same name in the same folder as in the gcf in you tf folder, dunnow about pakratting
If you don't use the other texture you can place a file that has the same name in the same folder as in the gcf in you tf folder, dunnow about pakratting
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