I had an idea to combine the game changing HR+ function with this workout structure.
Using this, there is no need to worry about reacting to reaching the 83% HR cap in the protocol: Trainer Day takes care of that.
Just keep pedalling and the power will change as necessary to respect the HR cap.
In this workout, each of the 20 minute intervals starts with 1 minute in ERG mode at the protocol’s 85% FTP. Then HR+ takes over for 19 minutes.
Currently I have set the HR to 146 (81% of my HR max). I think that will give enough room to respect the 83% cap. If that doesn’t match your HR zones, edit the workout to set that HR+ target to whatever you need / want. In the workout editor, the numbers in yellow are the ones to change
Here is a link to the workout. If you try it, please consider commenting about it here.
ETA: based on feedback (next post down) from @Alex I added target power to the HR+ controlled sections of the 20 minute intervals.