In case anyone else is interested, I got my LL Strimer Plus 24-pin and 3x8-pin GPU cables in and test this out. The Strimers connect to the included LL controller, and then it has an optional cable you can use to connect to aRGB 3-pin 5v output, like a motherboard or whatever. I cut the end off of that cable and wired it up to a 4-pin Corsair type connector like the QL120 fans use. It technically only uses two of the three wires, ground and data out. The 5v power is supplied by the LL controller. Connected to a Corsair Commander Node Pro that comes with the QL120 3-pack fans, as long as it's connected on port 1, or after your last fan (since they run in series), iCue can control the Strimers, but since the Commander Node Pro has to control all devices on it as the same type of device, it shows up as a QL120, so you have to select the individual LEDs that light up the Strimers.
Unfortunately neither iCue nor farbwerk 360 (or any aRGB 3-pin controller) can control all LEDs individually. The Strimers are limited to controlling LEDs across the strips in parallel, so the 24-pin Strimer can individually control 20 sets of LEDs, and the 3x8-pin Strimer can control 27 sets of LEDs. The way the LEDs are configured in iCue a lot of effects look wrong since they are designed for fans and don't line up right with the strip. With farbwerk 360 you don't have this problem, you just drag down the controller to 20/27 LEDs and effects work like any other LED strip, but still limited to parallel LED control, unlike the LL controller, which can light up different areas of the strip with the built-in effects.
So, bottom line, you can control the Strimers with farbwerk 360 or iCue, but no individual LED control, but you can at least do it in software, and not have to open your case and push buttons on the LL controller to change effects/colors/brightness, etc. The color options with the LED controller are also extremely limited. It looks like even LL's Uni Fan Controller is limited like the farbwerk 360 controlling LEDs in parallel since it connects with the 3-pin aRGB connector. There is a video that shows the switch from LL controller with more effect control to external controller control where effects are in parallel in this video. It's around the 10:50 mark where it's switched:
Lian Li Strimer Plus - To use on Uni Fan Controller - YouTube