Grannyring, I have not heard the Dueland, but, in the past, have rewired my speakers with Neotech. For what the OP Is asking for, warmth, I would include the Neotech copper as an option. I know you have heard both, so in your opinion, the Dueland is actually warmer?
I was once getting beat up by a Seas XL tweeter and Class D amp, and found Audioquest Type 8 solved the issue, but added a tint on everything. Maybe Audioquest Type 4 bulk? At the end of the road I changed amps, and went back to more open cables, so agree using cables as tone controls is a dead end, but doesn't cost much in this case to rewire the speaker, and should be fun to see the difference.