I believe there are a few RSS project builders on nostr. 🤔
Off the top of my head: nostr:nprofile1qqsrhuxx8l9ex335q7he0f09aej04zpazpl0ne2cgukyawd24mayt8gprfmhxue69uhhq7tjv9kkjepwve5kzar2v9nzucm0d5hszxmhwden5te0wfjkccte9emk2um5v4exucn5vvhxxmmd9uq3xamnwvaz7tmhda6zuat50phjummwv5hsx7c9z9
nostr:nevent1qqsqqqrrf4a92mt28lh5efxryd43q999kvdj7cdehzvlra9u53rzuhspz9mhxue69uhkummnw3ezuamfdejj7q3q80cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsxpqqqqqqzksmqtf