Is it possible to launch the ackolor picker modal from another element

I am trying to build a custom widget to control my lights. I really like the modal that pops up with the ackolor picker, but I’d like to be able to trigger that by clicking a different element in my widget.

Is that currently possible? I know that custom js is locked down.

No way to easily do this, but you can try using CSS to override the style of the .c-ckolor__picker class (I do it here - making the circle smaller and adding a border around it).
What you could even try is to make the element transparent (with opacity: 0 for instance) and cover the area you’d like.