NERO can already broadcast any signed transaction - you just need to pass the payload to the merchant. currently that's not supported via QR but should be easy enough to add.
odysee wouldn't allow signups over tor, and peertube only gave 5MB of upload size. do you know of any more alternatives?
Monero @monero.town ANONERO @monero.town 2y ago Announcing ANON / NERO: DIY Hardware Wallet for Monero
give it a try and let us know your feedback!