For the Blender Video Sequence Editor, render selected strips to hard-disk and add the rendered files as movie strips to the original scene in the first free channel.
Install this file: https://github.com/tin2tin/add_rendered_strips/archive/refs/heads/main.zip
Sequencer > Menu > Add > Rendered Strips
Usually unrendered Scene Strips are not playing in the correct fps, rendering them with this add-on will ensure correct fps. The VSE Scene Strip Display setting will be used for the rendered strips.
0647.png0001-0653.mp4
Footage from HERO by Daniel Martinez Lara, Blender Studio.
The rendered strips can also be used for EDL export using this add-on: https://github.com/tin2tin/ExportEDL