more difficult solution:
Save game to disk.
Copy disk (backup)
Assembler monitor (Action Replay cartridge or something)
Load Save File BW1SAVE[X].DAT to $7e0e-$7fd6
for example:
$7e3c = Briley MP
$7e3d = Cat SK
edit
delete old save file
save $7e0e-$7fd6, with proper file name