Hello,
Disabling the Intel iGPU *after* having booted has zero effect on indirect displays because Windows uses the GPU used for POST (the one used before and during boot). Disabling in Device Manager will get black screens if the iGPU is really disabled or no change whatsoever because on some architectures it doesn't disable anything.
Unless nVidia changes their application, nothing is going to change.
DisplayLink technology works on nVidia and nVidia is a supported GPU. What the add-on nVidia software does has nothing to do with GPU support.
What is the value of that nVidia add-on application?
Regards,
Alban
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