I am notoriously difficult to find a vein on. I have been in emergency situations where they needed to get an IV in me and they couldnt do it even after 3 different people tried.
But what are you even trying to accomplish here by finding ways to force a lethal injection to work? We have a far more effective way that just works as-is with absolutely none of these risks and is more humane... why are you trying to wrangle a way to keep injections alive at all?