I know that this is an old question, but due to the fact that there is a general dearth of technical information for the 1stGen Expeditions here, I'll answer it now in case someone else needs answers in the future. I know you've likely solved the issue by now.
Yes, the clutch can come out with the A/C compressor still installed in the truck. There is a small bolt in the center that goes through the center of the clutch. Removing this bolt will release the clutch from the compressor, and you'll have access to the magnet and bearing. Be careful -- the washers that may/may not drop out when you remove the clutch are SHIMS, not simple washers. These shims are used to space out the distance between the clutch and the A/C pulley. Make sure NOT to lose that shim.
If you're after the bearing, you'll likely need to remove the bearing and the A/C pulley as an assembly. There is a circlip in there that will need to be removed. This circlip is directional, so make sure and note how it came out, and which surface of the circlip faces outwards. The A/C pulley may easily pull off, and it may not. If it seems stuck, you can give it some 'motivation' by prying on the back side of it a bit. Not too hard, though. Once the assembly is out, a new bearing can be tapped in after the old one is tapped out of the center.
If you're after the magnet, it can also be replaced after the A/C pulley is removed. The magnet assembly is lightly pressed on and can be removed by prying it loose. Installing the new one can be a challenge, as there is not a lot of space in there to tap the new one in place, but it CAN be done if you're patient and careful. The magnet is "clocked" and will only fit if it's rotated in the correct position (or 180 degrees out), as there is a relief in the housing to allow space for the plug. On our trucks, it will be clocked so that the the plug will generally be in the "10-o'clock" position. Attempting to install it in the wrong clock position will likely damage the plug.
Make sure and space out the A/C clutch with the shims to the correct spec -- 0.015 to 0.025 inches. Too far and the A/C clutch and pulley will get hot enough to roast your bearing (ask me how I know...). Too close, and the clutch will rub and make noise. If you're not replacing the bearing, and don't remove the A/C pulley, then the shim that came in it will likely do fine.
