Editing textures of existing tracks?

Hello. I am looking to edit textures of the tracks Hockenheimring and Assen. I want to edit the things like the logo's placed around the track for custom ones.

From Google searches and personal attempts, I've found that editing existing tracks can be a pain in the ass. Is it possible to successfully convert existing tracks to .fbx, edit them in ksEditor, and export them again flawlessly? Is there another method for this goal?
 
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