I got the timing device off using Beagle's suggestion about an extractor. I borrowed my neighbor's bearing puller with out much success. Here's how I did it:

I used the two long bolts from the thermostat housing bracket, which have the same threads as the ones on the timing device. I have a small combination wrench that was the same length as the distance between the bolts on the timing device, and I used that to bridge the span. Between the wrench and the shaft, I inserted a combination of flat wrenches and a socket which just fit into the center of the device. Tightened the bolts gradually, doing a little at a time, and the device moved forward, finally coming off! I know for a lot of you guys something like that is a no brainer, but for me it was a flash of brilliance.

The center of the device and the shaft have the remnants of the woodruff key smeared all over them, with the key hole of the shaft indistinghable from the rest of the metal. Also, the extra metal on the shaft is preventing the bushing from sliding off.

I'd like to fix this without removing the IP, because if I need to remove the IP to access something, I'll need to remove one from the pick and pull as well in order to get a replacement part, if they have them at all. I guess I'll make an attempt to remove the remainder of the bolt next, and clean up the shaft as well as I can, but for right now, I'm going to take a coffee break and celebrate! That timing device was a monster.