I have a small suggestion: instead of letters, you might try to leave all the fields blank and use part of the description of the term as a hint (similar to a crossword puzzle).
That would then change the whole concept and turn it into a crossword puzzle of a sort. soliton made such puzzles for the community in the past. I linked to
his thread in my OP. Maybe he will eventually continue in the same way. The last post he made in his thread, he mentioned that the next puzzle will be posted shortly. I guess he hasn't gotten around to it yet. Maybe a bump from someone who likes solving puzzles would give him the incentive he needs.
The word games will continue...