Clegg Zeus, three-diode negative peak limiter?

[KD1SH]

Thinking of installing the three-diode negative peak limiter in my Clegg Zeus. The Zeus mod transformer has a tap on the secondary - looks to be right in the center in the schematic - which it uses to supply the screen of the 4X-150 final with modulated screen voltage.
In the schematic, the wire run marked "20" goes to the 4X-150 screen, and the run marked "8" carries the modulated B+ to the final plate.
Any thoughts on how this would effect implementation of the negative peak limiter?