Hi WillFly,
The issue with converting the Hamilton 992's, and really most American pocket watch movements, is the keyless works. Unlike most European pocket watches where the stem is a working part of the movement, the American watch company's preferred to integrate the winding and setting stem into the case by developing the adjustable sleeve system. As you know, the movement and stem are separate from each other until the movement is placed in a corresponding case connecting in a male/female system. This fact makes it Very difficult to convert these types of movements. I've seen it done, but I'm not really sure how it was done.
I know that some American pocket watch cases have the sleeve mounted directly on the stem and not in the pendant like the majority of cases. Most of these were made around the 20' and 30's to satisfy the design style of the day where the pocket watch cases were very small and not much larger than the movement itself. The movements were not changed in any way, just the case/stem design. This CAN be used retrofitted to a wristwatch case, but the only adjustment would be to modify the length of the stem that enters the movement by filing it away. The movement is not modified in any way, as far as I know...
I've seen a 992 converted to a wristwatch form some of the chaps in the Ukraine....There's a lot of pocket watch conversions coming out of that part of the world. But, most are all Show and No Go! Very shoddy workmanship and parts thrown together! They look beautiful but I've heard horror stories once folks actually get their watches in hand.
Don