Background You have a two applications called Blue and another called Pink. Both are on the same workspace and together they are part of a group of "Mini Apps" (Note: this is a nod to Page 7 of the Oracle APEX Lifecycle Technical Paper). To the users...

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David Smith
So, very clever!
But the thing is, I've been grappling with this exact same problem with a monolithic app I've been working with the client to "modularise" into separate apps. So they all share a menu. And of course, the menu items that can be seen are dependent on the app you're actually on, and what security permissions the user has (it's legacy is a two-level tab interface from APEX 4 - ugh!).
So, I defined it in a database view (workspace applications share database schemas right?), and each application now just references its navbar as a dynamic list: select * from v_navbar_list;
Always happy to see different ways of achieving this though. :)