Can you give a screenshot to illustrate that.
One point is to have the approve time right at something.
Then to make that something as negligent as you can.
Finally to make it as easy as possible to get the right.
In practice that means giving approve time right to a locked (or even inactive resource if I recall correctly)
Then give that right to an OBS unit to which everybody normally belongs. That would be then the normal OBS at top level and the mode unit and descendants for those who not associated to the top unit.