Assalamu alaikum ya ustadh In the different qira'at of Quran there are "differences in usool" and "differences in furoosh", my question is, is it permissible to recite in prayer or outside prayer following the usool of one rawayat like "hafs an Asim" but reciting different furush like ملك يوم الدين

Ustadh AbdulAziz al-Haqqan

Imam Ibn Baz said one should not combine readings in the prayer but recite with one reading