rss-feed 301 redirect after disabling the blog page that the rss feed is created from

Hi,as the title says I want to have the 301 redirect for my old podcast feed (https://www.futurehistories.today/podcast-episoden?format=rss) kept in place even though I diable the blog that created the rss-feed once. I tried disabling the site and putting in a manual redirect (/podcast-episoden?format=rss -> https://futurehistories.podbean.com/feed.xml 301), but it didn't work. I need this because if I don't disable the old blog page it will still pop up in search results and I can't put in a redirect for the blog page if the blog page is still enabled (a bit like -><-).Any help is highly appreciated .

BestJan