yes... but what I have in mind may complicate things and I'm not sure if it will even work with netslug, but it's worth a shot
Build the neek2o mod of (s)neek, specifically uneek+di (aka uneek2o+di). If you go to ModMii's main menu it's under the sneek option.
Basically, with uneek+di AND and emulated nand (which ModMii can build for you too, or you can extract your own personal nand.bin dump) you can load an alternative system menu saved off your hard drive, then access the DI menu by pressing 1, and selecting the game from your HDD you want to "insert" into your disc channel