Many of us, including me, have come to that same conclusion regarding privacy, and are also planning to switch from Google Chrome to another browser.
That is definitely doable, but would require a lot of manual work changing to the Safari Actions.
I long ago switched all of my Browser actions to use FrontBrowser Actions and Tokens. "FrontBrowser" applies ONLY to Safari and Google Chrome, for now. In KM9, a number of Chromium-based browsers, like Brave and Vivaldi, will also be supported.
So my suggestion would be to convert your Macros to all use "FrontBrowser" and then whichever Browser is FrontMost will be used. That would allow you to easily change your default Browser to any of the KM supported Browsers and your Macros would all work automatically.
You might be interested in a discussion we have started:
Evaluating Chromium-Based Web Browsers (alternates to Google Chrome)