So... I did manage to make and publish a cheating mod for this game, found
here
Over 240 people have checked out the thread by now and noone has said anything, so I'm assuming it works even though the 1st release was not that clean or user friendly. So version 0.0.2 of the mod is now avalible which fixes most of those issues.
For those interested you can change the Relationship points as well as change weather you or Anne are in a relationship with other characters.
Except for Layla... for some reason (probably because her code flag is in upper case while the rest are in lower case) I cannot get her to work properly. But I am trying to fix it and find out a workaround.
Please let me know if it works and/or if it needs improvements (for example if I forgot someone).