Hi Don,
After studying your photo, I think removing the spokes could be risky if the nipples are seized solid onto the spokes, as it could easily result in damage when you try to loosen the nipples.
You can give them all a squirt of penetrating oil and let it stand for a while before attempting to undo them, but if they won't undo easily it might be better to clean them up and treat them in place as best as you can, instead of risking broken spokes (or rounded off nipples) by trying to remove them with excessive force.
As long as the controller cover screws come undone easily, it should be fine to remove them one at a time, clean them off and then refit using some anti seize compound. I would not use Loctite on them as it might make it more difficult to remove in the future. Just ensure that they are nipped up correctly without over-tightening them.
If you want to blow out any dust trapped between the controller and the disc mount/cooling fan assembly this should not cause any problems as the main hub assembly is typically well sealed.
I always try to follow this well known advice: "If it ain't broke, don't fix it".
Alan
