The two weeks are only for sharing across accounts in a family, if you’re using the same account across two devices there isn’t a time limit. You could already play your games on both but before the secondary device needed to connect to the Internet every time you launched the game, and now it’s just when loading.

Drastic is the best DS emulator for android, I forget if it was changed to Free or if that was just announced and hasn’t happened yet. If Drastic isn’t free at the moment, then MelonDS would be the next best option.