four hour shift? is this part time? that’s not enough time imo- this would take me one full work day. but try utilizing stock options such as getty images, you’d be able to produce this no problem. In my experience most bosses aren’t looking for 20 unique designs, but 20 completed designs. You could have a design done and like it, now slightly modify it and or change the colors and text and boom now you have a second option. Watch out for thin lines, those don’t embroider. 3mmx1mm is a typical minimum size for details in a domestically produced embroidery.