You could try Motes, they’ll fit the bill!
One Pi (a Zero W makes a lot of sense) plus a Mote host will let you individually control all the leds on up to 4 separate strips.
I’ve seven different lighting installs with them, and can control them all through Hass.
I’ve put up a how to guide, though I’ve a much better way in the pipeline.
In the meantime if you do get them, the guide and code bits will certainly let you play with them!
Couldn’t be without mine 
If you want to add another Pi power supply to the mote host itself, they’re so bright they can hardly be looked at.