Hilt’s 64 Trout - 6 cavity, sz. 8, 10 hook.
Every once in awhile Ament precision single cavity molds come up on ebay.
Do-it did make a 1/64th in the PRO series, very hard to find.
Downside to the semi-custom you can only use a sz. 10 or12 hook. The plain collar lists for $119.95 and the collared lists for $150 (????).
You might want to check with Shawn Collins for a custom mold or he might have one on the shelf.