Multby6
Don't know if you know this but you can farm gallery coins by starting new games and rushing through the start where there are a bunch of coins and collecting the same coins over and over (3 per minute or something). If the plan is to have a finite amount of gallery coins then attaching the gallery to a save, or having the coins state persist even in different saves may be the move. That is if you want unlocking the gallery to be a challenge. of course this doesn't really matter much but just though I'd bring it to your attention since reloading saves before a coin doesn't work (so I thought you wanted it to be hard to collect all coins).
Of course I plan on abusing this so cheers mate
Edit: after some "Testing" It seems that it'll only work on fresh save slots as in one of the ten save slots that hasn't been touched before and you can keep doing it but whenever you see a book (saving book) the coins states will be saved for that save slot and it'll be ruined. So as long as you collect the first 3 coins and never go on to the next area you can just keep restarting the game in the save save over and over again If autosave is on if it's off this isn't a problem and you can go anywhere you want just don't save and the coins will be yours.