I bought a MK7 3DS for about $80 from Gamestop.com. It will come on 6.0.
Mod that to CFW, and give it a dummy account. On that Dummy account, buy Field Runners. It's a DSiWare, $5. Plailect has a guide for installing a hacked save to Field Runners on the CFW 2DS. Follow his guide, it's going to involve a System Transfer to get that hacked save onto your 3ds and use it to downgrade to 10.4, then to 9.2, then 2.1, then installing CFW and upgrading back to 11.1 with Luma.
If you have any saves on downloaded games, back up what you can through JKSM or SVDT, as you're going to format the 3DS before the transfer so you can link the Dummy account. After the guide, when you have Luma on the 3DS, you can format it again (Luma will stay, but you'll have to reinstall FBI/HBL/Luma Updater CIAs through Hourglass) and re-link your own account.
I say use the Dummy account so you won't have to wait a week between 2 system transfers. This way you only have to perform one, and not even on your account.
Either way, after it's all said and done you will have to re-download your titles and restore any backups you made prior to doing this.
It's the only way to softmod, depending on Shipping you may spend a little over $90 (unless you can find a cheap used system on lower than 11.0).
I can confirm that using the Dummy account works to prevent a week wait, despite what some may say. I did the modding in 2 days: 2DS on day 1, system transfer and modding of 3ds on day 2.