Bah, sorry to hear it John.
Maybe a Skeleton neck knife or scout carry with a thumb ramp that doubles as a bottle opener?
Something on the smaller side, maybe a 2" - 2.5" blade and a 5" - 5.5" oal. The front of the ramp could just be drilled and cut out with a hack saw/bandsaw fairly easily.
This way it would still be comfortable, and purpose built as a 3 finger knife, while still having a full range of usage. The handle can be drilled for a cord wrap or for handles to be added by the customer, if they are so inclined. Maybe 1/4" and some 1/8" holes for lashing and pins if slabs are made.
Different blade shapes could work well depending on usage.
A straight back for cleaning small game or maximizing the edge length, a skinner/Canadian Belt for skinning/caping, a drop point or semi wharncliffe for campfire work and bushcraft type uses.