My understanding is that if: (1) you want to originate travel in Egypt; (2) you want the Egypt fare; and (3) the fare for originating travel in your home country is higher than the fare for originating travel in Egypt, then you'll have to buy the ticket in Egypt. Here is the relevant rule:

119N WHEN TRAVEL ORIGINATES IN A COUNTRY FOR WHICH A
120N SPECIFIED LOCAL CURRENCY FARE IS PUBLISHED AND TICKET
121N IS SOLD IN ANOTHER COUNTRY, THE EQUIVALENT AMOUNT MUST
122N BE THE FARE CONVERTED USING THE BSR OR THE FARE
123N APPLICABLE FOR ORIGIN IN THE COUNTRY OF SALE,
124N WHICHEVER IS HIGHER.

How someone outside of Egypt goes about purchasing a ticket in Egypt is a question that someone with greater expertise and experience will have to answer.