I have not taken the approach outlined, but will give it consideration. The third point is interesting, as most publishers do not provide the data or means to automate self-audit or prevent non-compliance, thereby necessitating compliance audits as we know them.
I do recommend that organizations track the time and effort for software license audits, particularly those imposed by a publisher or compliance organization. This information can provide some leverage in contract negotiations. And, in one case, my client presented the publisher with an invoice for what was considered an unwarranted audit. While they weren’t ‘paid’, there was some value provided in other forms.