@FluffyPotato
This is worth a try, as usually you can export the vehicle's '.yft' to XML ('.yft.xml') using Codewalker's RPF Explorer & reduce the scale of the extra you want gone to zero.
So the extra spawns but doesn't appear/can't be interacted with etc.

Tutorial covering all that here:
[ Tutorial ] How to disable/remove specific EXTRAS from vehicles/vehicle spawns