Sort a nested Association by another Association


I have a nested association of numerous pixel values sorted by sample date (e.g. 20190422C) and futher by a strain percentage (e.g. 0, 30, 50).
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I want to sort it even further using and Association of Rules assigning each sample date to a planar thickness.
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I tried to AssociationThread and AssociationMap the two Associations together but to no avail. Help?