Change RDBMS instead of changing configs from their default value? They're configurable for a reason.

Are there any other serverless SQL DBMSes?

Lots. Firebird and DuckDB come immediately to mind. Wikipedia lists several more, though not all of them are relational: https://en.wikipedia.org/wiki/Embedded_database

Thanks for the suggestions. I did some brief research on those two and DuckDB in particular looks enticing. I'll have to remember to give it a try on my next side project.