I have verified your issue and I can confirm that autobooting a disk does indeed work. The only problems as I see it are:
- You don't have a compatible drive to autoboot a recovery disk as I do if you did buy a modchip.
- I don't believe that SSBB will load via a modchip on disk or SD. (someone needs to verify since I don't have copy to test with)
*If SSBB will load via SD then you should be able to simply reinstall your SM since the Hackmii installer will exit to HBC. If you left HBC for any reason before reinstalling your SM (4.3) you would have to do it all over again because selecting HBC from the SM also leads the a corruption error.
*You might be able to use Indiana Pwns exploit in the same manner as above but keep in mind that both methods will require an original disk.
I am not telling you that using a game exploit will work as I don't have a copy of SSBB and my Indiana Jones disk is out on loan so please don't go buy anything based on what I am telling you. I do know for a fact that your Wii can be easily fixed by someone that has the equipment including the modchip and a DVD drive to temporarily swap out just long enough to recover.