Interesting web findings: There's a Japanese chap who's trying to transfer data to and from his PC using audiowaves via mic and headphone ports. Someone else made an overlay for the touchscreen so there are real buttons for the keyboard, but it's kind of small.

ptc1 had a .txt to qr converter online, but ptc3 doesnt have camera access. that audio transfer might work to get it off a 3ds but not back on since the 3ds headphone jack is only headphones and mic interaction seems to only be able to pick up audio spikes but someone might get it to eventually. if you need a physical keyboard just wait for the wiiu smilebasic thats on its way

No. It was speculated, but not implemented.

Thanks for the replies. As an experiment, I had a program create and write to a TXT file. Then I examined the SD card contents on my PC. Ugh. Even TXT files are encrypted. I guess I'll close this discussion now. If anyone finds a solution, please reply to any of my journal entries to let me know. Thanks.