Ok, i tried to export a sequence with that Mesh Swapper Plugin, and it worked. However, what did absolutely NOT work, was the preview of the sequence in UE. It would not show any animation or changed/swapped meshes during tests in the editor. BUT during export the animation worked flawless, had tested it with 2 different projects and scenes.
The good thing about this plugin is, that you really just need to drag and drop in your meshes, that should be displayed or swapped out, set your playback speed, save the animation, and then you can attach it to any regular actor via the MeshSwapper Component, that comes with that plugin.
Then you just need to drag that actor into your level, and it will animate during normal play, will most likely not show anything in your sequence preview, but will capture everything, with the legacy Sequencer and the Movie Render Queue aswell.
Edit: The trick mentioned here
worked too with sequencer, if you want turn on or off the animation. Was able to switch the animation on and off with a bool being “Exposed to cinematic”, but again, it was not visible during the preview in the Editor, only in the final sequence.
How to expose variables to cinematics:
