[piva00]

This would be my suggestion as well. I helped some art projects running 50-100m of LEDs, we first attempted segmenting and power injecting but it was much easier to just split them all up, and ultimately using a LED controller with many outputs to send data.

I don't think in OP's case a controller such as the Advatek ones would be attractive, they are quite expensive but perhaps some WLED-flashed boards being centrally coordinated could be a last resort given it would increase complexity and potential brittleness to the setup.