I would not do it. GH is a very fragile protein peptide and I'm not sure how caustic the solvents in the helios would be, when mixed together. At the cost and energy that goes into purchasing and using GH, I wouldn't take the risk. Not to mention, I have never persoanlly seen spot fat reduction when taking GH sub q, so I don't believe it would be of any benefit. Personally, I like to take my GH IM, ising an insulin pin with a 1/2 in needle. I'll stick it in a muscle that is never covered with much fat, like a delt, rear delt, tricep or bicep. 

If you want to, I don't see a problem combining your HCG and GH in the same pin. They both are disolved in bac water and are only going to be mixed from the time you draw, to the time you inject. The HCG can be taken IM as well, if you are planning to use your GH in that method.