I'm glad you're trying to come up with a strategy because I know first hand how damaging "faking it" is to ones well being.
Some of the fear and anxiety you are likely experiencing about what's ahead, could very well be caused by the meetings themselves. As I've said in other posts, toward the end of my lifelong stint as a JW, in order to cope with the anxiety that attending the meetings produced, I had to hide a small container of beer in my car and go out to the parking lot to have a few mouthfuls during the break, just to cope with the stomach flip flops and waves of panic that would come over me. I'm not a drinker at all and if you knew me, you'd never think I'd ever have to resort to something like that. The horrible anxiety and mental distress that I was plagued with for almost a decade, disappeared about a week or so after I finally decided to pull the plug on the JW's.
You're in a cult or cult like religion so you'll have to be creative and get comfortable with being a bit coy and vague about your personal thoughts and feelings on that subject. Remember, you don't owe anyone an explanation and you don't have to make excuses. This isn't a job or a duty....you are going to the meetings and in "service" voluntarily to "supposedly" help you maintain a relationship with God...not to please other people . They often believe they are acting out of concern for you, when in truth, they are more concerned about their own discomfort when someone steps out of the role they've been pigeonholed into.
If you can manage it, I'd recommend missing as many meetings as possible and when you do attend, have a book or something inspirational to read, downloaded on your ipad or mobile device. Sit near a wall or somewhere others won't easily be able to look over your shoulder.
To make things interesting, I used to raise my hand and make comments that were designed to reveal an alternative thought while appearing to be pertinent to what was being studied.
Example during the Watchtower Study: ( Even though Scientist today scoff at the idea of a global flood and the impossibility of being able to store on a floating vessel, a years supply of food and water for large animals such as elephants and Hippos. And even though they've used modern scientific methods to calculate that there isn't enough water on the planet, whether in it's atmosphere or subterranean reservoirs, to flood the entire globe to the heights of the mountain tops. We as JW's have been taught to trust that if the faithful and discrete slave says the account of Noah was literal, rather than an allegory meant to convey a lesson, then that's how it is until if and when new light is shed on the matter.)
As far as door knocking, you could "claim" to have done a bit of "incidental witnessing". Most of us here on this site are totally "out" or are "inactive" so if it would make you feel better, you could make a post here every week telling us something you heard at the last meeting, or just quote a scripture or two, that way, theoretically, you could count your time, on us.
You could also check out your own "territory card" and if anyone asks, just tell them you pop into the territory on own when you can squeeze in a few moments. Then just drive through there once in a while on your way to somewhere else.
If you are suffering mentally or otherwise because of all of this, you could go the "depression" route. JW's seem to accept that diagnosis more readily than anything else since a lot of them have been taking Childrens Chewable Prozac early childhood. You could join all the other "depressed souls" and call to listen to the meetings over the phone, but don't actually listen.
Anyway, try to take the "emergency" out of this and be creative and flexible as you navigate your way.
