there is no way to play Wii U games from the SD card?
If you want to get reeeeaaaaly technical, yes, but:
https://www.amazon.com/Transcend-Super-Multi-Card-Reader-TS-RDF8K/dp/B0056TYRMW
so....yeah...but no.
As for loadiine, I use it for other games (DS games, mostly); it can also be used to set custom screen sizes, in some cases.