You may be able to change the colours of each line after you have called stackedplot. For example, you might (and I say might because my version of MATLAB doesn't support this function) be able to do the following
myColours = ...; % this is your 12x3 matrix of colours (one for each line)
s = stackedplot(...); % passing in your timetable data; s is a handle to the stacked plot
for k = 1:length(s.LineProperties)
if k <= size(myColours,1)
s.LineProperties(k).Color = myColours(k,:);
end
end
The above assumes that you can iterate over each plot object and change its colour...which the documentation seems to suggest that you can do. Also, one of the examples includes a legend which, when used, seems to change the line colours too.
