Hi Ste! Thanks for helping me keep this theme up to date!
Mono styles the topbar for narrow screens, which means, on its own it doesn't need a separate mobile plugin.
However, if you'd like to use the core Menubar plugin, or any other topbar plugin, I can update Mono so that its topbar both in narrow and wide screens can be offset (to accomodate the extra space needed by the additional topbar) up to the distance of user's choice.
Do you think that can be a good compromise? My main desire for my themes is for them to be very accomodating to other plugins as well!
-jd