Much like the Revolut trick of old when using the Argentina and Turkey stores, games can be purchased at face value from the Hungary Xbox Store but using any debit card without the use of a VPN. Naturally, fee free cards are going to work best ie. Monzo, Starling, N26, Clarity and Revolut.
A slight saving can therefore be had buying this game vs purchasing from the UK Xbox store.
Go to the relevant game page on the Hungary store and click the blue ‘Buy’ link and log in using your usual U.K. account, this will first ask you to set up an account address for that their region if you don’t already have one set up. Google is your friend.
It will then ask you to add a payment option, this is where you add the payment card of your choice.
It is advisable to completely avoid the use of a VPN.
The game will then be available to download via your console as you normally would.