What size are the HST units?
Using the 8 at a time method, just enlarge it to make more units. Take a large sheet of paper and draw them out on grid on the paper. Be sure to add the seam allowance. I used freezer paper for an example to play with sizing and was able to make 48 at a time.
Put the 2 fabrics right side together. Mark the cutting lines and then and sew diagonally across each side of the cutting line. Sew all the way across the fabric. You need to cut in between the sewing lines and also the squares. You will be cutting the whole line at once instead of square by square.
You will square these into the units size you need.
Example of method. Just use bigger pieces of fabric.
https://www.thesprucecrafts.com/magi...-units-2821440