I am bedridden in a reclining position such as you describe and I have difficulty holding onto my e-cig as well, and have, on a few occasions, had a mouth full of juice instead of vapor. I was thinking about a pipe as someone mentioned, but I drop things and can't pick them up if they are out of reach, even if they are in the bed. I would be interested in finding out what you come up with. I am sure that with the talent I see just on my first day here someone will have the knowledge to help you. It seems so far that all of my questions have been asked, or I have found many answers just reading where things take me.
Best of luck, and if someone comes up with a great suggestion, I would love to hear about it or see a picture. My first day and I have already learned more than I have learned in nearly four years of dumping my analogs. I am sure you will find a solution, and maybe I could benefit from ideas as well. Thanks for asking such a great question.