The problem with licking the face, as I have seen more then just you post, is with a dog that begins to get frantic when that doesn't work. Licking can sometimes lead to nipping ....
Don't knowing what all your medical concerns are (and I'm not asking
) perhaps you can sit down and think of a "job" for him to do.
Some people have trained their dog to:
~ roll them onto their side to make breathing easier
~ go to someone in the house with a trained action to bring person back
~ push a 9-1-1 button mounted on wall (only good if you happen to be in the home)
~ push a Life Alert (or other brand) button that the handler has on person. (I don't know how far the distance is for these to work.)
After the dog does whatever task it needs to do it can then be trained to lay down next to the handler. If the handler doesn't respond then the dog would be doing what it was trained to do - lay down vrs. getting frantic and possibly injuring the handler.
If you ever get to the point where your dog is pushing a button to summon help you also need to work with your dog to allow strangers into your home. This is of course harder to work on but you can't expect a dog to guard the house and
allow rescue personnel easy access into your home.
It is always a good idea for an owner trainer to have access to a trainer with SD training experience to have on call for advice and a couple of hours of time to explain and demonstrate how to work with a dog if needed.