R4i-SDHC V1.4.1 was released on Sep 23rd, 2010 and available on Sep 26th, 2010. It is built with B1-V4.1 electronic chip, not B1-V3.10 for R4i-SDHC V1.4. R4i-SDHC V1.4.1.
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)