Transferring app menus to a monocrome menu cog icon in the window title

Now that elementary OS has it's own window manager to work with, is it possible that the menu bars of non-elementary apps could be done away with and transferred, using whatever mechanism the unity panel uses to get them, to a menu in the window titlebar. This could use a little monochrome version of the elementary menu cog and would sit on the left or right, besides the close or maximize icon. Or perhaps those could be moved to the left and the cog could be at the right. This would mean window controls are grouped together and the window menu is on it's own and made more noticeable.

I realise elementary OS is trying to move away from having long menus, but short of refusing to install non-elementary packages many apps that a user installs are going to have menus that break away from the clean menu free design of the system.

Since Ubuntu already has a method of getting the menus and putting them into a different app and has even managed to do this for Firefox and Libreoffice, is it possible to take advantage of this and use the same method to put the menus into the window decorations, now that we have a forked version of Mutter to work with?