I was going to post the same query but Stefan beat me to it! Can you indeed use the L-Enhance as usual to capture a few hours of emission nebula then image the same on another night with UV/IR filter and then combine the Ha/OIII component with visual spectrum RGB to improve star color? Keen to see how this would work (keeping it scientific document worthy).Another approach might be to use the l-enhance for what it was named for. Expose for several hours with the filter and use the stack as luminance data. Expose also without a filter (or an UV/IR cut) and use this as chrominance rgb data in the compose module. Not sure what result you would get. But I hope I can test this soon.
How would this be done in Compose? Load the L-Enhance stack in the Luminance File slot, and the UV/IR stack in the R, G, B File slots equally? What do you set the Luminance, Color setting to? Do you set the exposure sliders as well?
Interesting to get the team's and Ivo's sage advice.