Another developer forked the mod and made some updates to it.

You can download their version here if you're interested in using it: https://github.com/rislaed/KCTalkingCards

1.1.0

• Added ability to customize adding a new starting deck and replacing cards in vanilla decks.
• Curved sprites have been removed, icons of replaced cards are used instead.
• Game balance is saved by default, a separate starting deck is included optionally.