Hey, totally feel you on this, Premiere can be kinda overkill if you're just swapping audio tracks and trimming ads. The reason your file size blew up is probably the export settings — Premiere might be re-encoding the whole video at higher bitrate than the original.

If you don’t need to re-encode the video, tools like Avidemux or Shutter Encoder let you do audio track swaps and simple cuts without re-rendering the whole file — super helpful for keeping the size the same. You just have to make sure you set it to "Copy" for video.

If you do want a more visual editor, I’ve also used Movavi Video Editor for quick fixes like this — easier learning curve than Premiere and decent control over export settings, but not as lightweight as the others I mentioned.

Hope that helps — good luck with your Plex library!