I wouldn't worry too much about this. I use an unsweetened almond milk that has 40 calories per serving (20 from fat), but sometimes I use an unsweetened soymilk that has 80 calories per serving (35 from fat).
I only use a cup per day for cooking, and don't even use it every day. I don't think that the difference of a few calories or grams of fat has any impact as long as I stay within the McDougall guidelines for 10% fat or less per day... which I do.
Now, I know there is no reason to use a commercial plant milk. You could make oat or banana milk at home for practically nothing. But, I don't. I'm aware it isn't nutrtitionally necessary to substitute anything for dairy products. But I still use these products on occasion.
Why? Just because I want to
.
So personally, I would just relax and use the quinoa milk if it adds some enjoyment to your food (and life).