With the new ExB Dev Edition 1.5 you can Link to "Blocks" now.
So a possible workaround is to add a button-widget in the header. The button links to a Sidecar (add a window - sidecar). In the sidecar you can add more buttons and link the buttons to the needed sections (blocks).
Would be lovely if there was an option within the "Menu" to switch to "blocks" instead of "pages" (+ the ability to do a block selection or the option to "hide blocks from menu"). I'll post this to the ExB - Idea section
- Andi