Use the menu designer to create a shortcut menu that includes the items you want. Use Insert Bar to add the right system menu bars. Generate the menu.
Then open the file and remove everything on the DEFINE POPUP line after the name "shortcut" (including the SHORTCUT keyword). (You might want to change the popup name actually; you certainly will if you're using shortcut menus.) Remove the ACTIVATE POPUP line at the end. Save changes.
Then, when you want these items available, run this MPR. You'll only need to do it once and it'll stay in memory.
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