I see what you did there. You trickster you. And you can still keep mocha in a different folder if you want to load it up for Wii U USB Transfer Tool's Speed Hack.Question 1: No, no homebrews injected in a Wii VC could use the USB, except for the controllers.
Question 2: I think no because we need a rpx version to make a channel.
Question 3: No, it's only for Wii VC witch have been modified to use it.
Last question: The patch is disabled if you exit a Wii VC because the console reboot. But you can do a trick with CBHC if you replace Mocha's elf by Sign_c2w_patcher.elf, renamed to mocha.elf in the "wiiu/apps/mocha" folder of your SD. After you do that, you should boot dirrectly with the Sign_c2w_patcher if you select Mocha during your CBHC boot.
Hope these informations can help you.