Hi Daydreamer
I've not really come across acupressure being used on the ears, although in theory I suppose there is no reason why not. In practice, the points need to be needled, or stimulated with a little stick-on magnetic stud.
In terms of a "whole body tonic" I don't think it really works like that - with most people some organs need a "tonic", whilst others need a "clear out". These actions are opposite in Chinese medicine. It is about finding the balance, not just boosting everything up!
A whole body re-balance will ideally come about through treating just one or two points, not a whole load of them. Finding which one or two points is part of the art of acupuncture, and I don't really think there are any shortcuts.
Best wishes
Aragorn