Is gnomenu a normal executable? If it is, you'd have to do something like editing Openbox' "autostart" file I guess (if LXDE is still based on openbox), and replace the line that calls lxpanel for one that calls gnomenu.
If gnomenu is an executable, you probably can find out what it is by typing in a terminal or "launcher" dialog, "gnomenu". If that doesn't run anything, on a terminal, try things "whereis gnomenu", and/or "apropos gnomenu", "man gnomenu", etc. Should give you clues.
It's possible though that it's not an ordinary executable, but something that requires a whole lot of gnome to be running, in which case it would make some steps approaching gnome itself in "non-lightness".
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