in doing a good deed such as cursing the killers of Imam Hussein alayhi salam,is it permissible to say Ya Allah I seek your pleasure and the pleasure of your Prophet Sallallahu alayhi wa alehe wa salam and His Holy Daughter Sayyad'ate Nisa al Alaamin by cursing Yazid (la)

Yes you can say because that we are saying for the pleasure of Allah, Rasul saw and his family.
إِنَّ الَّذِينَ يُؤْذُونَ اللَّهَ وَرَسُولَهُ لَعَنَهُمُ اللَّهُ فِي الدُّنْيَا وَالْآخِرَةِ وَأَعَدَّ لَهُمْ عَذَابًا مُّهِينًا

Surely (as for) those who speak evil things of Allah and His Apostle, Allah has cursed them in this world and the here after, and He has prepared for them a chastisement bringing disgrace.
(Surah ahzab ayah 57)