Xmas lights turn on event

Hello! I've been tasked with handling my villages christmas light display for the turn on. My idea is to build a large lever/switch that the primary school kids will "flip" a switch which will start a countdown on a 25x20 curtain, During the 10 second countdown, from the switch I will run an LED strip that shows "power" going into 5/6 arches that will also fill with "christmas spirit" and then finally the tree will come on.

I'm trying to figure out the best way to trigger the tree lights through xlights or should I just keep it simple and do it manually.
Any thoughts?

also are there any sequences available for something like this or am I doing it from scratch?
 
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