If you're iPhone is jailbroken, you can proceed with the following:
-Open Cydia
-Add
http://ios-webstack.tk/cydia to your repo Sources list
-Search for ios-lighttpd-php-mysql
-Select Install (it will display a long list of dependencies), confirm, then respring
-Use a file explorer app (like Filza or iFile) from Cydia to go into /var/www and copy over the contents (html and dat files)
-In Safari, type 127.0.0.1 (if it works, it will display a page saying so)
-Now if you use your phone's hotspot, determine the hotspot IP address of your iPhone, then type that IP into your 3ds (after connecting to your hotspot) along with the applicable fw exploit html link (example
http://172.20.10.1/fw40.html) **I renamed my htmls for convenience's sake**
-If everything works, it will push the payload to your device.
Not sure if there is an easier way, but this is working for me. Also unsure of how this will affect battery life. I don't know if there's any way without a jailbroken iPhone though. I took the path of least resistance in my situation.