For the moment the only way is by using Decrypt9 with a copy of Cubic Ninja with NINJHAX installed on it.
There have been reports that NINJHAX works on GW with a ROM, haven't heard of anyone who have tried it on n3DS though. It's worth a try anyway. Probably has a better chance of working if you use a separate SD card (one that has no emuNAND on it) and boot into GW mode on your 9.0.0 sysNAND, run the Cubic Ninja ROM from there and install NINJHAX (
http://smealum.net/ninjhax/ ), if the homebrew launcher loads then Decrypt9 should work (but it's possible GW mode might break it since it has some exploit code built in that may not work in GW mode)