I'm assuming this entire thread's basis is on turning off the Switch to get the SD card?
If your CFW is on one of the most recent versions, it should allow you to restart back into CFW.
Select Power Options > Restart, then when it goes into black screen (before it restarts), you can eject the SD card,
and your restart will pause, requiring you to inject back the SD card.
Once you inject the SD card, and press button, it'll properly restart into CFW.
(that's the method I use right now, cause I dislike tegra smashing again and again)
Use at your own risk, of course.