Around about this time I also started attending a rehabilitation facility here in Montréal or had access to ergo therapist. I explained this problem to them in the solution they came back to me was... keyrings.
What's interesting here is not so much the zipper tab itself, as where I got them… And the best thing is I got about 30 of them for free! Enough for me to address every pair of pants and shorts that I own… And then some…
The first thing I did was to walk into the local Mountain equipment co-op store showed them the ones I had on my bag, explain my situation and asked if that were possible to acquire some. The customer service person was more than happy to do so and gave me what was on hand which is only three or four of them. Once again for free.
Obviously, this wasn't quite enough to address my needs. So I got on the phone and called Mountain equipment co-op's online customer service directly. I once again explain the situation and what I was looking for to the agent and I would be more than happy to purchase number of them. He paused for a second and said "don't worry about it, I will send out a bunch classified as a repair".
I've always liked shopping at Mountain equipment co-op anyway, then this level of generosity and customer service I thought was just great. Sometimes all you have to do is ask ;-)
What I particularly like about the zipper pulls is there discrete, durable and little plastic knob at the end makes it reasonably easy to grab. There are a couple different types, the ones they sent me have a little small plastic knob. But the better ones I find is you can actually get a form longer plastic knob to grab onto. Those are the best…
Also if you prefer to purchase some or are having a hard time finding some, I find you can order zipper pulls online at CPGear for about $2C a pair. I find this to be a little bit expensive, so maybe it would be worth shopping around at various online military surplus/tactical stores.
Pro: much more discreet than a key ring, easy to grab… did I mention I got them for free?
Con: there are various types, and the wrong ones might not address your dexterity needs.