Apparently, if I've got this right, there are two ways to follow a Space page via a tag.
One is to attach the tag to the page.
The other is to have a Project page with the name of the tag and redirected to the Space page.
That way, more than 3 following tags are possible. But the problem is, you can only redirect to one page. A tag should follow all relevant pages. If the project expands to use a bunch of Space pages, the cutting edge where the updates are happening won't usually be the "home" page.
But you could advertise. On the home page, have a list of the other pages and when they were last updated. When updating any page, update the last-updated date on the home page. Then, anybody following the home page gets nudges for updates on the other pages.
You could also pick a lead profile for each spelling of the name, and advertise on that. This would cover all spellings of the name without the need for redirected Project pages.
But Project pages are the only way to get rid of the pesky "Nobody has started a" messages on the Genealogists page.