Hey JMHenriques! There are a lot of files and systems which interact with one another, so the answer for this would be dependent on how you wish to implement the toolkit into your game.
If this would be a separate “Level” where you can simply load the card game (toolkit) and all of its framework pieces, then this should not be much of a hassle. If you wish to seamlessly integrate this into regular gameplay on top of your current framework, then it is likely this it will be more timely to convert the project instead of writing your own.
In saying this, you could use the toolkit as a reference/ guide for writing your own game and taking elements which will more benefit your project rather then bringing across a large amount of unnecessary functionality. Hope this helps!