Play second ending in "The World Next Door" without replaying the whole game?

“The World Next Door” has a couple of places, where you can get somewhat different information based on who you priorize interacting with. But the big distinction is in the ending, where a binary choice is given.

Sadly, the game autosaves after the last dungeon, right before the final scene, and it doesn't have a savegame system other than “continue from autosave”. As a consequence, there is no obvious way to replay the last dungeon with the second option.

Now, I really liked the game and would like to see both endings. But I didn't like it enough to play it all over again, just for that.

Is there any possibility to play the second ending without starting the game over?

From the relevant reddit post:

• For the PC version it is possible, but only by backing up the savegame before making the decision. (They should be stored inside the installation directory.)
• Switch players are probably out of luck.
• The next best thing I found is this youtube video.