As of version 8.1 of the "MySQL Connector ODBC", Oracle is only providing 64-bit binaries. It is still maintaining the 8.0.x branch to continue 32-bit support. Might it be possible to tell PMPC to not upgrade installs of 8.0.x to 8.x without fully excluding updates to the 8.x branch?
From the release notes for version 8.1:
"MySQL Connector/ODBC 8.1.0 is a new GA release version that supersedes the 8.0 series; it's recommended for use on production systems. This release can be used against MySQL Server version 5.7 and higher. MySQL Connector/ODBC 8.0.x exists to continue 32-bit support."
https://dev.mysql.com/doc/relnotes/connector-odbc/en/news-8-1-0.html
From the release notes for version 8.1:
"MySQL Connector/ODBC 8.1.0 is a new GA release version that supersedes the 8.0 series; it's recommended for use on production systems. This release can be used against MySQL Server version 5.7 and higher. MySQL Connector/ODBC 8.0.x exists to continue 32-bit support."
https://dev.mysql.com/doc/relnotes/connector-odbc/en/news-8-1-0.html