I have attacked the issue on two fronts. One was with stage film for stage lights and the other was will dimmers. Most LED dimmers work on the ground lead to the lights. I have installed 4 of them in our 2019 Laredo 225MK.
This is the dimmer I used. I remove them the enclosure and install them in the wall, ceiling, and panel.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Check this tread on installation.
http://www.keystoneforums.com/forums...ghlight=dimmer
Film to adjust color tone:
Roscolux 3409: Roscosun 1/4 CTO, I used two layers of 1/4.
https://us.rosco.com/en/products/fil...oscosun-14-cto
1/4 gives you the option on 1/4, 1/2, or 3/4 depending on the number of layers.
Edited to add correct detail.