Unfortunately, the most you can do is hack the diamonds to make choices free. But that presents a problem, especially when you realize a few factors.
1)Yes, a few mods, recent ones as well, can and will successfully negate the need to spend diamonds, but the passes still reduce. Unless you don't mind waiting 6-8 hours for your passes to refill, you will only be able to play two chapters every 8 hours. If that's ideal for you, a quick google search will come up with a few legit hacks for this app.
Unfortunately, for every legit hack, there are about 90% of hacks that are either outdated or completely non-legit. As a security professional who is tasked with attempting to ascertain whether or not something is hack-proof, I am well-versed in the signs of a virus-filled application.
There is yet another danger, if you're a member of Sbenny. Apologies for namedropping, but I am NOT singing their praises, and you'll see why in a moment.
There is a VIP section on their website where they advertise a hacked version of this with 2,000 passes and 2,000 diamonds. Catch is = they no longer offer VIP memberships, due to the abuse from VIP members (you may be asking, 'so why don't they just kick out the VIP members who are screwing up', right? Issue is that Sbenny doesn't *care*. That individual is corrupt, but that's a whole other topic that isn't appropriate for this one) and that you must spend earned real-world currency to buy 30,000 SB bucks (virtual currency used by the website) to unlock that game.
Please note, that recent purchasers have commented that after spending that amount, they did not receive any confirmation that they had an unlocked game. The deal is that the gems and passes would come 24-48 hours after the purchase. This is improbable, and most likely not legit.
The sad reality of the situation is that for most games in this sub-genre, passes or advances or whatever the devil they are are not easy to hack (Choices and Chapters being rare exceptions). Also, even if you feel like using real world funds to purchase passes on a hacked app that unlocks diamonds, you'll run into some issues, because payment will not be authorized. If you attempt to use LP to circumvent this, it will not allow you to do so even if you have successfully hacked the game using that tool, you get a popup requiring you to email customer support.
Hope this helps, and I am very sorry if it's not what you wanted to hear.