I'd love one but I suspect that no-one will have signed up for the beta to NOT want the code. Unfortunately.
Sadly, it looks like we'll just have to keep registering and hope that Sony extends the beta and sends out more invites. I'm not sure how they determine who does and doesn't get the invites but you would think they'd prioritise users who have bought lots of games and have low space on the internal console storage... like me! And, yes, I'm sure my PS5 is sending back information to Sony letting them know what games I'm playing and from what storage etc.