Well, I had a tough time finding ICs that were not surface mount only. How annoying. Makes prototyping difficult.
Step 1.........signal conditioning. I will use a positive edge triggered flip-flop with both outputs tied to an OR gate to double the pulse count from the low res signal.
This is because I couldn't find a dual edge triggered.....anything. So, for compatibility sake, I had no choice. (counters only see the positive-going edges)

I will have to check each signal output, to make sure I don't mess up the count, with an oscilloscope. Because I'm old and forget things when my child is eating the dog's food with too much gusto. Have to complete this thought later, I have to save the dog food.