Using qr codes for the rsvp

I think that sounds just fine. Wouldn't change anything.

I would just modify the third sentence and write, "please reply by August 24, 2022". Most know they cannot show up without notifying the host of attendance. But, I guess it depends on your guestlist-- do you think persons may show up without an rsvp?

Also, I think you have time before sending out formal invitations. If not a destination wedding, invites should go out closer to 4-6 weeks before the wedding so persons don't forget. You can mail, email, text a Save the Date much earlier. Your venue will provide you with a final, final guest count so they can supply enough meals, often 1-2 weeks before wedding. Best wishes.