You are better off shooting 2x per week. You will just have to get used to it.
What EQ are you using? Is it 500mg/ml? If not, the you will have a couple of cc's from that at least, and if the test is 200mg/ml you will have a cc of that too.
Thus you have a minimum of 3-3.5cc's. That is more than I would want to hit in my quad at one time. Glutes can handle that kind of volume, but unless your quads are huge, then you better split it up or inject in you glutes.
As to your original question of mixing, thats no problem at all.