We do not recommend embarking on an oak wilt management program without confirmation from a non-biased, university-based plant clinic. Action should not be taken based solely on a "field diagnosis." There are a number of tree health issues that produce symptoms that mimic oak wilt. As you have learned, management can be expensive. So, you should first confirm that oaks are, in fact, infected. 

Here is the website for the Ohio State University, Plant and Pest Diagnostic Clinic:

https://ppdc.osu.edu/home

Here is the link to instructions on how to take and send samples for a suspected "vascular wilt" disease, which includes oak wilt:

https://ppdc.osu.edu/submit-sample/landscape/wilt-diseases

Here are links to the fee and form that you must send with your sample. Please note that in the upper right-hand corner of the form, you will find a box saying, "To Share Results with your County Extension Educator." You can put my name in the box: Joe Boggs, Hamilton County.

https://ppdc.osu.edu/fees

https://ppdc.osu.edu/forms/plant-diagnostic-form

If you decide to seek help from a tree care professional to collect and send the samples, you can share my response to your question with them. This includes my suggestion that my name be included on the form. While oak wilt has not been confirmed to be widespread in southwest Ohio, we encourage confirmation so we can track occurrences.