Willgerodt synth. styrene to p2p: do you guys think one could get a better yield substituting nh2-ch3 for the ammonia in this reaction?

If you are refering to the document

https://www.thevespiary.org/rhodium/Rhodium/chemistry/willgerodt.html

then, no, yields are poor using amines other than morpholine or benzylamine.

Benzylamine is obtained via reduction of benzaldehyde, using NH3