I’m trying to get the IK to work. I’ve excluded some parts from the bone rig, and want to include them again - apart from using the undo, which it’s tool ate to do, I can’t find a way to do it. Is there a way to either re-include the parts, or even to just reset the whole rig?
If I understand you correctly you can save the rig as a template and then use it again by dragging it from the template library.
Select the part in the Timeline and press the toggle Exclude from IK in the Tools Properties for the IK.