Just in case you didn't see it already, we have a library available for using Decker in concert with Twine: Twee.
In the simplest cases you can write normal Twine passages using the "Ply" story format, which is like an extremely stripped-down version of Harlowe, export a .twee file and pop it into a "plyPlayer" contraption; no other coding required. With a little scripting there are many ways to make a Ply story interact with a deck or vice versa- change cards, display visuals, play sound effects, etc.
I hope you'll find that Decker is a very flexible digital arts-and-crafts medium that you can use for a wide range of creative projects, tools, toys, and games. Welcome to the community!