....
1) All finishes are safe once cured.
2) Only specific FDA approved brands are safe. (Even though they contain the same ingredients that non-fda approved finishes contain.)
3) Food grade oil and beeswax finishes are the only safe finishes.
.....
This is the current belief with woodturners, yes. But I have a hard time believing that a CA finish or any finish that has isocyanates would be human safe when dry (since food is already dead, I will use human safe instead). There are also polyesters used in woodturning that use cobalt in the mix, and I am pretty sure that wouldn't be either.
While these may be on the outside of the spectrum for what most people would use, we need to quit saying all finishes are food safe. When it was just oils and lacquers, that was probably true, but I would even challenge Bob Flexner on this in todays world.
Now, based on what you are trying to make, I would think the glycols in the gap fluid might break down any finish, so I agree with Harry, acrylics or man made material. Besides, they'll dig (yep, I said dig) the swirls and stuff in the patterns of the acrylics. Look for high detail figure since its small pieces. Some other options might be antler, bone, ancient ivory (mammoth) and just bare wood.