I know I'm a bit late for the party, but I wanted to share. So for the past week I was making save editor for Valheim using GTKmm under Linux. It was more a new experience using Glade and GTK than an fully featured app, but maybe someone will find it useful. ATM it has basic functionality like changing name, apppearence, guardian power.
Feedback much apprecitated.
Cheers and enjoy.
Source: https://www.reddit.com/r/valheim/comments/od8dzl/valheim_save_editor_for_linux/