No but I have thought about making some sort of card or pseudo-book. Still not quite the same though, as the object wouldn’t be the one you actually read, just a reminder.

TBH I'd rather have both and in sync, namely physical in place, nearby, and digital always with me. Unfortunately I can't afford that so I have a messy compromise.

Make each pseudo-book a cheap cover around your ereader and just stick it in while reading :)