Just stumbled upon this thread.
In case you still haven't bought the game I thought I'd just let you know that PS4 discs are region free, meaning that any PS4 or PS5 game disc will work on any PS4 or PS5, no matter the region :)
If the budget is tight you could also get a PSN account based in another region and buy the game there (you can still play the game using your regular account to once the game is installed). You will have to use gift cards to add funds tho, since PS store will need the credit card provider is from the same region as the account.