Just wean off by replacing progressively more of your regular coffee with decaf coffee and then keep drinking decaf. You might not even notice that much if you

Just wean off by replacing progressively more of your regular coffee with decaf coffee and then keep drinking decaf. You might not even notice that much if you do it over, say a month. 75/25, 50/50, 25/75, 0/100. -- Or, wait til you get sick. Quit caffeine cold turkey, you won't notice it over the sickness and by the time you are improving, you will have less symptoms and you will be taking time off anyway due to the sickness. You say you have noticed productivity drops in the past, but I wonder how long you waited them out? My experience is that caffeine withdrawal is not terribly long, maybe a week of subpar focus, but still able to work.