What variant of tap-mysql do you recommend? The singer one is... quite old https://github.com/singer-io/tap-mysql. I need to fork and make a change, but I fear it would never get merged

Pipelinewise's is actively developed: https://github.com/transferwise/pipelinewise-tap-mysql

https://hub.meltano.com/taps/mysql is the best spot to check for good varients. If it's not the best variant I"m sure Meltano will fix it