I wasn't sure if it's possible, so I tried something that could work:
- In the \www\js folder is a plugins.js file which contains everything set in the plugins for the game. Open the file and search with crtl+f for "YEP_MainMenuManager" to get to the part where every option of the menu is listed. Every possible slot for the menu is listed, even when emtpy, so there are a lot of entires for Menu X with X being the number of the location in the menu.
- The entries for save and load are in the menu slots 85 and 86. I exchanged those entries with the empty slots in 93 and 94 to put them below the other menu options.
My test attempt seems to work. You can download the plugin.js and try to replace yours with this file: https://mega.nz/file/OpQVDKbJ#_6hk2KJmNuPu3VGSmoFWZbeybtbeYtC0bziunapGT1w