[sirpucna]

i went down a similar path to you to for dark blizz frames, check out a project on curseforge called 'Blizzard Raid Frames - Debuff Highlight By slothpala' to get you started

using the above project as a base, heres my mod i did for dark frames

local restoreColor = function() end
local function updateRestoreColor()

	restoreColor = function(frame)
		blockColorUpdate[frame] = false
		frame.healthBar:SetStatusBarColor(0.192, 0.2, 0.219)
	end
end

keep in mind hooking "CompactUnitFrame_UpdateHealthColor" is quite expensive CPU wise

you will have to make other changes like converting the background to light color etc