Is it permissible to write "فلا يخاف عقباها" (then he will not fear its consequence) in the Mushaf instead of "ولا يخاف" (nor will he fear), despite it contradicting the Uthmani script, given that it is a mutawatir (mass-transmitted) recitation?

The spelling of the word "فلا يخاف عقباها" (fa lā yakhāfu ʿuqbāhā) in Surat Ash-Shams differs among the masaḥif (copies of the Qur’an). In the masaḥif of Madinah and Ash-Sham, it is written with the fāʾ (ف), and Nafi‘ and Ibn ‘Amir recited it this way. However, in the other masaḥif, it is written with the wāw (و), and the remaining reciters recited it with the wāw. This difference arises from the Companions' recording of the masaḥif based on what was established in the Qur'an’s final review (al-ʿArḍah al-Akhīrah) and what the Companions heard from the Prophet (peace be upon him), and in adherence to his saying, "The Qur'an was revealed in seven aḥruf (modes/dialects)."