Privatus Analytics is privacy-first web analytics with no cookies, so no cookie banner is needed for it. It covers visitors, sources, goals and funnels, plus uptime checks and testimonials.
To add it to Ghost, paste one script tag in Settings > Code injection > Site header. The step-by-step guide is here: https://privatusanalytics.com/docs/install/ghost
There is a free plan. Happy to answer questions here.