Firmware Updater v4.3b is a firmware updater for Wii made by waninkoko that downloads and installs firmware 4.3, but leaves out the new added protection. This version got rid of the bug that caused the hbc to disappear on usa and jap wiis
I don't have a wii u anymore to test it myself, but if homebrews are not visible on the wii u menu I think you can press L + R + minus to open the plugin menu, there should be an option called "homebrews on wii u menu" or something similar
Or when your player dies, you can say in code, if enemy exists, do nothing, but if enemy does not exist, then create enemy at certain spot. (This would be a pain tho for lots of emeies)