If the corner was solid.
Now this is a very crude sketch but hopefully it makes sense.
The left side represents a traditional joint. The right side shows three connecting points on a corner. At each connection there would be two fingers on one side and one on the other. between the connecting points would be open space.
It obviously wouldn’t be as strong as a traditional joint that uses the entire edge but for something like a pencil holder it should be strong enough.
It would definitely take more time to design than the 60 seconds I spent drawing this poor sample.
Something I would like to try when I hopefully get my GF in November or December.