Well, my project began with the idea of using an IR Remote,

Well, my project began with the idea of using an IR Remote, a Sparkfun Pro Micro, and a string if WS2812s. First, can’t use WS2812s with interrupts on a Mega32u4, so I switch to APA102s (They cost more). Then I run out of space trying to do some animations. So someone here suggested going to a Teensy. I have a Teensy3.1 that I never got around to using. So, more quickly than I could have hoped, I got the Teensy and its massive memory and speed running my code with the remote and the APA102s. Then I find out that the new FastLED supports interrupts and the WS2812s on the Teensy3.1. So back to WS2812s (I never did buy the full 5 meters i needed anyway). Wow, it’s been quite a week.
Here’s the question:
Is it possible to run WS2812s and the IR Remote on the TeensyLC? Is the same interrupt handling supported on the TeensyLC?

I’ve just confirmed that the TeensyLC will handle interrupts for the IR receiver and still drive WS2812s just fine.