Honestly, PS5 is a pretty bad console. The OS experience is not as good as the PS4's, the system itself is ugly and there's no games. Not a day goes by where I regret selling it, and even if Sony bought all the timed exclusives in the world I wouldn't go back because it's a bad console.
Just wait for the PC release. We don't even know if the game is going to be good yet, so I wouldn't recommend buying a console for it.
Plus if you buy/rent consoles to buy an exclusive game, you're just encouraging future PC delays and Square Enix's "let them double dip" and "we don't actually need to bother with non-PS platforms" mentalities.
Yeah FOMO sucks, but these companies should be bringing the games to you rather than you spending over the odds to play one game.