As you said, most of us probably have a fair number of dice, especially those of us who also do RPGs. Still, my main feedback is that would it still print well on A4?

Just fyi some folk on bgg designed origami dice, mainly for playtesting games with weird die faces. Maybe it’s interesting to you to compare approaches.

https://boardgamegeek.com/thread/608070/origami-dice

Very cool - perfectly made for it’s use case.

I guess if someone gets to angry with the roll they might just eat the dice, but that’s a problem for another time lol