What about changing your code to use the new naming convention?
Not 100% sure if there is an easy way to do it. I will ask dev if we can avoid making a custom pipeline to do that.
You can deactivate the Interchange FBX import with the cvar
Interchange.FeatureFlags.Import.FBX false
Else you can add a custom interchange pipeline that will do the renaming of metadata values to your FBX interchange pipeline stack. Add the uasset to your current project and then add it to you default asset pipeline stack as shown in picture. The asset was made in 5.5.1
IEBP_LegacyTags.uasset (124.4 KB)