Disease Sensitive Information Type Unusable (SIT) in MI, Need Term Exclusions

My organization is based in Michigan and MI is being flagged in both All Medical Terms and Conditions as well as Diseases (since the former contains the latter). I assume it is associating MI with the abbreviation for myocardial infarction. The majority of our documents have the MI state abbreviation. Diseases is a very important SIT to us since we are a public health organization. It catches a lot of terms that are not found by the ICD-9 and ICD-10 SIT dictionaries.

I cannot copy the Disease SIT within Purview to create my own (the option is greyed out since it is an "enhanced classifier" and I haven't been able to access it or export via PowerShell. I have tried creating a custom sensitive info type and Diseases is not an available option to use as a foundation. I would assume it could be found in the Keyword List or Dictionary options, but it isn't present. I really don't have a good starting point for creating my own version of Diseases. Any suggestions would be greatly appreciated.  

Ideally Purview would allow organizations to use its curated list of SIT options and over-ride them within the SIT or as each SIT is applied within a policy. That way the SIT would be kept current by Microsoft and the exceptions could be applied independently. Updates to the SIT dictionary would then have less impact vs. missing updates by creating a copy for your organization.