I'd do 3 screens, but I like optimizing for the result, not the time it will take to print. That's just me though.
Honestly, the reason for the 3 screens would be a nice clean fade, not the yellow. You could adjust the fade for dot gain, p/f/p and hit the yellow last and not run into any pickup issues. I would do maybe 50-65% under the yellow. It really depends on how much gain you expect. You don't want it to be visibly black anywhere under the yellow, you want it so the dots bleed together a bit.