Colour Wheel to control 3 light entities

I have a LED strip, well several of them. Each of them is controlled by 4 entities, 1 - on/off the other 3 are for RGB respectively. Right now I use a separate switch for on/off and a dimmer control to set each of the colours, so I can manually mix my colour. I’ve seen the custom light card but that seems to only control a single entity, I’m looking for a colour wheel type card that can set each of the colour entities based upon the RGB values mixed on the colour wheel.

I’m quite new to Home Assistant but I did read something on the templating but it was beyond my expertise. Is this still the correct approach or is there already a control I could use?

Thanks for any pointers.