Remove splinters with adhesive tape
Here's how Maia got rid of splinters without tweezers:
When my children ran barefoot across a patch of fresh beauty bark, they came away with tons of tiny splinters in the soles of their feet. I used a piece of translucent tape (scotch magic tape or the like) to remove the splinters. It also works on the tiny spines from maple tree seed casings, quite a problem here in our forest. I imagine it would work on other impossible-to-tweeze splinters, too.
Related: Tweezer-free splinter removal