I couldn't find anything so I wonder if it would be possible for someone to do:
A small prgoram that lets you browse your savegame node for node, search and edit it and declutter it.
If you for example would like to remove the entries of certain mods you could use the program to scan for non stock nodes and the look closer at them.
If you for some reason want to dump and erase your reports of mun you could do that.
etc.
I know there was something that let you do some of the things I mentioned, if I remember correctly but that was years ago.
Edit: This seems outtaded but looks almost like it:
Cheers.