I've been working on a launcher for this written in Decker. Thanks to some of the newer danger zone decker features I've managed to get something working. It looks something like this, the buttons lead you into a directory listing all the decks in a certain folder where you can launch them from.
I've whacked it up on github if you'd like to poke around. As a note, this is pretty specific to my setup and will require a custom danger build of native decker to work, so getting it going for your own purposes may take some effort but hopefully it can inspire some other works. https://github.com/micpp42/deck-kiosk-launcher/
There's a few things I can probably still do with it, like listing the names of decks a bit friendlier or patching in a nicer quit function (for now I've just got my desktop environment set up to auto-relaunch decker after you alt-f4 it) or some solution to hardcoding in the folder names to make it easier to add stuff but for an initial version I'm pretty happy with this.
Edit: there's a quick video of it in action on social media: https://bsky.app/profile/milliesquilly.com/post/3maxln5s5nk2i