Well, that was really quick ^^
I tried three times just to be sure it wasn't just bad luck (because it tends to happens a lot to me with everything computy). First on my regular playthrough, and the twice starting over in story mode, but I never saw the option even after the message telling me it was unlocked.
I finally managed to reach the required 50k gold manually and finish the game (I was vastly relieved to find out there would not be a next step requiring 100k !), but it was very tedious gathering all that gold. I had planned to start again in story mode to try the other romances, but not if it means finding all that money manually all over again ^^. But it is not a big issue, for that I can just reload, choose other romances and ignore the main story.
I looked at your link to send save files, but it does not include instructions for android (I forgot to mention I was using that version).