If you just want to cheat your money, then I'd probably recommend that you don't bother with any mods and just use dev mode in a clean install instead.
If you've never enabled dev mode, there's a nice little walkthrough that
Mr. Bubu always adds to the bottom of his walkthroughs.
Once you're in the dev console, then just type
money = 5
on the page before the choice that requires the money. You can add however much money you need so long as it doesn't exceed the maximum that your wallet allows.
Universal Ren'py mod is nice too, since it works on pretty much everything and gives a searchable interface for the variables.