I use a snorkel often but only when snorkeling. I have not had to deal with surface obstructions so surface swims are done on my back. I like to have access to a snorkel when far off-shore. I do believe I could even take a nap when aided by a snorkel. Tucked between my plate and wing, it is secure, readily accessible, and no problem to carry. It is so easy, that I often just leave it there even when I know I don't need it. I have deployed it a number of times. Once deployed, it is difficult to restore until the dive is over without help.
I looked at the picture you had earlier in the thread. Can you show a more close up shot as to how you have it attached to the plate?