Is it possible to integrate a private Runner cluster with my (Bronze) account?

I don’t have a gitlab EE or gitlab CE, instead I have a Bronze account.

However, the number of CI minute can’t meet my needs (and I don’t want to upgrade to silver yet). Is there a way for me to install a CI Runner cluster on AWS, and hopefully auto-scaled (even better hopefully being able to use AWS spot instances) and integrate it with my account?

(the doc seems to only take care of a self-managed gitlab service, which is not what I wanted)