Here is some research I did a while back on "the great city Egypt" of Rev. (11:8) and "the land of Egypt" of Dan. (11:42, 43) for what it's worth:
After the death of Messiah, “the Leader of [the] covenant” (cf. Dan. 9:26; 11:22), the identity of “the beautiful land” would change. Fleshly Israel as a nation would be rejected (cf. Matt. 21:42-44; 23:37, 38; Luk. 13:34, 35). God would choose a new nation, made up of people of the nations, for his Name (Ac. 15:14).This new nation (= spiritual Israel) would inhabit a spiritual realm, “the beautiful land”, i.e., the spiritual estate (or paradise) of God’s anointed remnant (cf. Is. 66:8). This new “beautiful land” (= “the land of the Decoration”) stands in stark contrast to “the land of Egypt” mentioned in Daniel (11:42, 43). Egypt then referred to the land of the Pharaohs as well as the headquarters of the King of the South. Moreover, in the first century CE, after “the beautiful land” would undergo its identity change, “Egypt” would acquire a new symbolic meaning. This is the key that would unlock the final verses of Daniel 11.
Because ancient Egypt was a hub of international trade, it would show hospitality to a host of nations (cf. Gen. 41:57). Its populace at that stage would be a fair reflection of the “global village” of today. In the book of Revelation she is portrayed as a great city, the capital of Satan’s debased world. This would in all probability be the new location of Satan’s throne during the Lord’s Day (cf. Rev. 1:10; 2:13). Rev. 11:8 informs us:
And when they have finished their witnessing, the wild beast that ascends out of the abyss will make war with them and conquer them and kill them. 8 And their corpses will be on the broad way of the great city which is in a spiritual sense called Sod´om and Egypt, where their Lord was also impaled.
What does this great city “Egypt” represent? In the Revelation Climax-book we find a detailed discussion on the subject:
Jesus was impaled there. So we immediately think of Jerusalem. But he also says that the great city is called Sodom and Egypt. Well, literal Jerusalem was once called Sodom because of her unclean practices. (Isaiah 1:8-10; compare Ezekiel 16:49, 53-58.) And Egypt, the first world power, sometimes appears as a picture of this world system of things. (Isaiah 19:1, 19; Joel 3:19) Hence, this great city pictures a defiled “Jerusalem” that claims to worship God but that has become unclean and sinful, like Sodom, and a part of this satanic world system of things, like Egypt.
According to the Keil-Delitzsch Commentary, “Egypt, as the chief power of the south, represents the mightiest kingdoms of the earth. (and there shall not be for an escape), expressive of complete overthrow, cf. Joel 2:3, Jer. 50:29.” Daniel (11:42) uses a form of hendiadys (Gr. hen dia dyoin, ‘one through two’). Lit. “And he will stretch out his hand against the lands (= the earths), and land (= earth) of Egypt will not escape”, i.e., “lands” = “land of Egypt” (cf. Zech. 14:17, 18: “families of the earth” = “family of Egypt”). BDBLex adds: “5. pl. ’ärâtsouth is almost wholly late… it denotes lands, countries, often in contrast to Canaan, lands of the nations.” A few translations add “other” to Dan. 11:42, usually in cursive script. However, this is understood and not part of the text.
Here “the land of Egypt” does not refer to Christendom as such, but the domain in which Christendom operates, amongst mankind alienated from God, i.e., the “world” under Satan’s control. This would include territories in the domain of the King of the South, as well as those held by the King of the North. In other words, “the land of Egypt” would here point to the current satanic system of things, encompassing the entire world. This is Satan’s counterfeit “kingdom”.