Sounds like you need to write an app to do this. It seems you want to aggregate data from multiple sources, keep secret, then send.
I’m tech inclined, but not a developer, lots of low/no code solutions should let you get pretty close fairly easily.
I’ll bet you could use a jobs site to “rent a developer” and it wouldn’t be too expensive.
Or find a 3rd party to collect and schedule the email.
I think my email service does something like this, though I don’t use it.
I settled on recipe keeper. It supports many platforms. It’s a one time purchase (per platform) and it has the ability to import from websites.
Print your business cards on them.
There’s also the xbrowsersync extension if you just want to save and sync bookmarks.
I may be a lost lemming though based on the community…