Since the exodus is part of the theme of the Bible (i.e. the Messiah), Pharaohs opposition to it makes his position pretty obvious, especially in light of Romans 9.
Pharoah's destruction with his army
is typical of that destruction of The People of God's enemies and their salvation through Christ rev 15:
2And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God.
3And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints.
4Who shall not fear thee, O Lord, and glorify thy name? for thou only art holy: for all nations shall come and worship before thee; for thy judgments are made manifest.
Lets look at the content of the Song in the exodous passage ex 15, Just a few verses because its very long :
1Then sang Moses and the children of Israel this song unto the LORD, and spake, saying, I will sing unto the LORD, for he hath triumphed gloriously: the horse and his rider hath he thrown into the sea.
2The LORD is my strength and song,
and he is become my salvation: he is my God, and I will prepare him an habitation; my father's God, and I will exalt him.
3The LORD is a man of war: the LORD is his name.
4Pharaoh's chariots and his host hath he cast into the sea: his chosen captains also are drowned in the Red sea.
5The depths have covered them: they sank into the bottom as a stone.
6Thy right hand, O LORD, is become glorious in power: thy right hand, O LORD, hath dashed in pieces the enemy.
So, the adopting of Pharoah by the inspired Apostle does indicate salvaic significance. It does not matter what pharoahs personal fate was as far as if he is going to heaven or hell, we do know that he was designed by God for destruction, as all the enemies of God and His people are.
BTW, The True Saints will Praise God in the end for the destruction of the reprobates of mankind even though they are our fellow creatures now.
Remember the souls under the altar ? rev 6:
9And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held:
10And they cried with a loud voice, saying,
How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth?
Notice that these perfected holy souls do not ask the Lord to forgive these wicked men, or do they desire their salvation from God's wrath and they receive no rebuke for that..