I thought it would be a nice idea to be able to replace badges on cars if you have a normal and png file.
wut? I think you can replace the badges somehow. You could take a look at the prasu mod. https://beamng.com/resources/hirochi-prasu.2251/ He linked a badge file which includes the real life badge and he changed it by purely changing the png I beleave. Badge: https://www.beamng.com/attachments/supra_real_brands-zip.271170/