Synced Database Across Different Workspaces

I run a couple different businesses and organize them as individual workspaces. That said, I have one single database in my personal home workspace where I put all of my ideas, shower thoughts, strategies, etc. Each of these ideas is relevant to 1, 2 or more of those business, so I tag each idea with 1 or more relevant business projects.

I am trying to have each workspace display a view of that centralized database with a filter for the tag that indicates its relevant to that business. That way Business workspace A shows all the ideas relevant to, filtering out any ideas that don't apply.

Displaying a linked database across workspaces USED to be no issue. You could just create a linked database and select the database you wanted, and it would let you select from all the workspaces you were logged into. But Notion turned that off for security and usability reasons and I understand that.

The workaround after that seemed to be "synced blocks" according to a few reddit threads, but this now also seems broken. I can copy a synced block and create a instance of the database view WITHIN THE SAME WORKSPACE, but if I try to paste into a different workspace, it doesn't let me paste the synced block, it only lets me paste as url or as mention.

Is there no way to represent a single database across multiple workspaces without involving some external 3rd party service?