Rig controls after binding
 

I have an old character that is bound to basic FK joints for control. Now that I know more about IK and rigging, Can I include Ik handles and Grab Icons to the joints without affecting the weights already on the joints and mesh?

yes. you can export your weights and make any adjustment to your rig then re-import the weights.

cheers.

Thanks alot. You just saved me some time.