I have a idea.

So I do want to keep all my little goodies I unlocked in the cash shop, So here's what I had in mind.
What I propose is; as a preorder reward. Anyone who played the beta keeps all Cosmetics they earned in the beta. (Styles, Emotes, weapons Skins, Sprays) . IF the game is free to play on launch then call it the focus test pack which could just be the Dev taking notes on who paid for it via their website. (log in and pay for it then it saves your store / skins unlocked for when the full game is out).

The price could be deemed on their terms.

As for the people who do pre-order but didn't play the beta, you get one free bundle pack OR the amount of funds that relate to the pre-order price.