FartWizard

Steam server browser. View at the top left, servers, add to favorites by IP, or you can see what seed its using in the games server browser.

They just added support with the latest update to do a -savedir command line. Only issue is I'm not talented enough to script it to somehow find the correct user profile for the server and add a \worldmap\ subdirectory in the root access area. The company itself should add a command line for "save path" to go into the valheim servers so we can download and export our maps via FTP