What does the DT8K not do that you need? https://intl-outdoor.com/tint-ramping-instant-channel-swiching-led-flashlights/dual-channel-dt8k-1-21700-dual-quad-high-power-led-flashlight.html
Unless you want REALLY rosy tint, I’d go with domed 519a version, dedoming makes the light slightly more pink, the issue is that tint mixing also makes the light more pink, see post below for explanation.
I don’t think you’ll find any LEDs with a duv this low, except maybe an overdriven sliced sw45k for ~4000K. But you can achieve this sort of duv level by CCT mixing. For example E21A 2000K + 4500K in my tint ramping IF25 :
I used 4500K because I only aimed for –0.01, but 2000 + 6500K gives 3700K ‐ 0.0120 at 0.7A per LED, it can probably reach –0.015 at higher current, though Maukka’s E21A data isn’t accessible anymore so I can’t calculate it.
The only manufacturer offering E21A lights in CCT mixing configuration is Emisar Noctigon I think, unfortunately they don’t have E21A 6500K, only up to 5000K.