I don't know if this is feasible for you but you can get syringes with needles that can be swapped out. I know some places use them when they have to dull the needle mixing solutions. You could try using one needle for mixing and then switch out the needle for a new one once your ready to pin.

Also, my dad has to do Subq injections 3 times a day for insulin and he just pinches his sides between the love handles and stomach and pins there so there's no risk of getting into the muscle. You would have to go very far in to get past the fat when you use that method. Just google some SubQ videos on how to do it.


Hope this helps.