The service schedule in my owner manual shows that only inspection is needed at 6000 miles. Replacement at 12,000 miles.
I had downloaded a service manual off the web, and it had indicated Air Filter replacement every 3,000 miles. I'd thought it was for the US, but -- after reading your post, I've since looked at the owner's manual that came with the bike, and it shows as you indicated -- air filter inspection at 6k and replacement at 12k.
I've got a way to go, but think I'll place an order for the belt and air filter from TBSC pretty soon.
I've placed one previous order with TBSC for the Key FOB kit they have, and in October 2022, it got flagged by Customs and Border Protection (CBP), and they still haven't released it. TBSC has been communicative during the Customs hold, and I've written to CBP as well - twice - the response I received from CBP each time indicated to wait 45 business days before contacting them again (which I'll do in another week).
It's not as critical as a belt, fortunately, but given this experience, I think it'd be nice to have the belt and filter on hand, especially if there are any shipping delays or if Customs decides to flag my motorcycle parts again.