So I managed to get hold of two 1mL syringes with a needle.
The chemist said they had strict policy and couldn't distribute them to me, but the vet could. I was somewhat oblivious to asking a vet.... But given that it is an issue of animal health, upon reflection the vet was the better idea. So yep, they supplied me with two.
I have injected the aiptaisa in the photo. Along with another small one I found on the same piece of rock. Luckily for me, the rock isn't too porus so we had no where to run. Immediately he shriveled up and lost colour. Now this morning, 8 hours later he is in a similar, if not worse state.
Will update further on my progress!