If you think you need Recovery Console then you know enough not to have any need for Backupmenu, as Backupmenu is just running commands that you can easily type on the recovery console, with the added benefit of having full control over the parameters as well as proper "error spotting".

No idea about multiboot (never used it, never will). The combination of bootmenu and recovery console (or even without bootmenu if you know what you're doing, hint: /sbin/preinit) gives you all the power you need