Have you tried adding to pocket and then using something like https://p2k.co/ https://p2k.co/ or https://help.getpocket.com/article/911-how-to-configure-calibre

Have you tried adding to pocket and then using something like https://p2k.co/ https://p2k.co/ or https://help.getpocket.com/article/911-how-to-configure-calibre-with-pocket https://help.getpocket.com/article/911-how-to-configure-cali... to sync to Kindle?