This may not be the right battle to be fighting. SQL reserved words have been written in all caps for a Very Long Time - it is a standard. From my personal experience, when I encounter legacy code where SQL keywords are lowercase I immediately think that the statements have been written by an inexperienced engineer (probably without any formal education).

The last time I encountered SQL statements with lowercase keywords, the individual included a table named user in their schema, causing all kinds of havoc, and reinforcing the stereotype.