That is totally awesome
Huge ditto marks on that statement!
Timbor, I tried to come up with something monstrous that might be adapted to your needs, but struck out.
Meridian's Aequatherium came to mind, but is both too large, and not really suitable.

I'm pretty sure there's SOMETHING that would work, but then getting the pea-sized walnut head seems another hurdle.
Not much use, am I.
Doug