Answered by Shaykh Faraz Rabbani
If a Hanafi reads du’a al Qunoot in Fajir prayer even so it is not part of Abu Hanifa’s math’hab to do so then is this ok?

It would be considered a contravention of the sunna, and blameworthy, in the Hanafi ijtihad. The only time one may recite the qunut supplication in fajr is when a calamity befalls the Muslims. In such a case, however, a relevant dua would be sought, not the Shafii qunut.
If a Shafii recites the regular qunut, one should neither raise one’s hand nor say “Ameen,” even if only quietly. If they recite a qunut for some calamity, one should still not raise one’s hands, but should say “Ameen,” quietly.