the keifer thing will work. Its very hacky, liam and I RE'd that save, I believe we can pragmatically fakelink accounts now without losing profiles and saves like keifer. just havent tested yet because ive been busy and hacdiskmount is buggy with large nands.
Well I hope one day you get time to do this, not for me, but for other people in the future.
Thanks for the reply!
I figured out how to restore the saves.
1:Before making the linked account - save game saves with checkpoint.
2: Make the linked account - reboot the Switch.
3: Now go to your system menu, and delete your game save for all the games.
4: Start the game - and then exit.
5: Open checkpoint and restore the game save.
6: Reboot the switch (this step is probably not needed - but I did this).
Now the game save should work with the new linked account.