Here is a recipe: http://www.adcham.com/html/husbandry/bug-juice.html you will need a decent syringe. I have not had to do this, but this is what I would do if my guy needs force feeding.
My son has a Leopard Gecko that he adopted from my brother 16 yrs. ago. Prior to that the gecko was loose in my brothers house for approximately 6 months without no known food or water. She is over 20 yrs. old! and still alive and well!
Maybe you meant to say giant mealworm instead of mealworm/superworm in your above post. I said "what" because you contradicted yourself. (y) I know nothing about mealworms. I tried your trick with superworms and they just wiggle.
I got a bunch today, I ordered them from ebay. https://www.ebay.com/itm/Live-Silkworms-Premade-Silkworm-Food/223445436007?hash=item340662c667:m:mAifr5vMXc6q_QHTBzU6U0Q&var=522201047209