I really don't see the issue here. Just move some games to an external HD and free up some space, it's not like you need 144 games on the 3DS at all times, considering 100 of those are probably shitty games anyway.
Do you switch between 144 games every day?
I left the country for about 8 months and loaded my 3ds with about 80 gigs of games, sometimes you can't get access to an external HD but you know you'll have plenty of free time to burn through games. Especially if you don't know if you'll even enjoy the game yet.