Interchange cvar settings in 5.4

Development Programming & Scripting
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2

You should be fine with Interchange plugin enabled and just disabling it for the FBX format.
you can disable it with that CVAR Interchange.FeatureFlags.Import.FBX=False

If you do not want to type if everytime you open your project, you can change the DefaultEngine.ini file in your project and add this in it.

[ConsoleVariables] 
Interchange.FeatureFlags.Import.FBX=False