I just have to write a SQL query for that: one minute to write that, it applies the change to any number of vehicles in one time as long as I can specify exact criteria (model names, years, chassis codes, or any other vehicle-related info).
Many other makes also have different model names for different trim or version of a same base vehicle (BMW or Mercedes for example).
I'll do that tomorrow if nobody is against that, that leaves a few hours to someone to comment just in case of