and I'm unsure what a total of 30ft of cable will do to the data signal.
Use two Nano output pins, one for each direction and definitely remember a series resistor close to the WS2812. Use a cable with signal and GND twisted is also a good idea, the power for the leds can be feed from some other wires.
Odd you are only keen on sticking to an absurd adherence of specifications on other people's designs and not your own.
My advise is the best way to transfer that signal 10ft without extra electronic.
So you think a twisted pair will transfer a 1MHz signal? The act of using a twisted pair increases the capacitance of the cable thus screwing it up even more than three wide length of ribbon cable.But digital signals at those sorts of frequencies need a differential driver, then the twisted pair makes sense.
Ribbon cable is not that common anymore
that is long for 1MHz, but definitely not impossible.
Rubbish, I use lots of it.
Like I said you are not so good at looking at specifications for your own recommendations, only you are shit hot at erroneously criticising others.
Look have you tried this? It is a rubbish idea you are promulgating even if you had. Sure it is also not reliable, will radiate like f***, perhaps to the extent of being illegal, and is simply the wrong engineering solution.
We have a certain responsibility here to offer the best advice we can for a beginner. You in my opinion are falling short of that ideal.