Multiple PWM-Output TLC5947

i get my TLC5947 running on the Wemos D1 mini - it is able to drive 24 discrete PWMs/Leds.
Now i want to use it together with wled.
I want to use them to light up some lego models - together with the WS2812b
What would be the right approach?
I thought of implement them within a own segment and special effects, which has to be selected with this segment(s). The brightness can be used from the master-slider.
Other idea: extend the amount of leds within the ws2812b-strip an read out the values cyclic to put use them within the TLC5947
Any other solution?
Any hints will be helpful…