Vlad I think it would be ideal to use a standard iOS context menu (the Orion one feels different to standard ones, especially regarding scrolling), and collapse all extensions under the "Extensions" item as a standard sub-menu (with a final item for "Manage Extensions" which would bring up the current extensions management sheet). That way the menu would only ever show the current 9 standard Orion items without multiple extensions pushing core Orion items off-screen.
Here is an example of a menu like this from Files under a (...)
icon, which I think Orion could copy exactly, where "View Options" would be "Extensions":