Just in case anyone was curious. Obviously be aware that you'd run the risk of ruining your experience with the game. Note that you have to reload the game for some changes to properly take effect.

1) Locate your save file in C:\Users\[username]\AppData\Local\BBPSX\Saved\SaveGames.

2) Upload the file to https://www.saveeditonline.com/ and edit whichever values you please.

3) Download the edited save and replace your previous save with it.