Clearly preloader wasn't installed on the NAND dump you made.
HBC through Bootmii does not support Wiimotes, you will need to use a gamecube controller.
Are you not able to launch Wii Menu through bootmii though, you'd think you'd be able to as it was probably working when you did your NAND dump.
If you are stuck then you'll probably want to re-install the System Menu, which should be easy enough with a gamecube controller, a mod of wad manager, an IOS.wad and a System menu wad. What system menu did you start with? What IOS is HBC using when you bootmii to it?