Wouldn't Sky3DS have some way of doing a pass-through downgrade/decryption? Or pull out encryption entirely to use on older 9.2 firmware? Bring up web browser, call up Sky3DS, pushes back to SD and then prompt false upgrade/downgrade back to 9.2 and then let people install GW...?
The fact that we can hide apps/files in other games like OOT, wouldn't it be able to call up files on SD and re-encrypt them passing through the 3DS firmware?
Heck, blank out encryption on 9.2 firmware, have Sky3DS pass it through sysNAND, spits out 9.2 with encryption, false prompt for update, downgrade back to 9.2.
Just a stab in the dark...