Forward RSS feed from old blog to RSS feed from new blog

Aloha!

I just started a new WordPress blog a few weeks ago, but there’s this little thing I can’t seem to get fixed. (boo for me!)

My old blog still exists — in maintenance mode though — and 50-100 people still have the old feed in their feedreaders. I want the updates from my new blog to be visible through my old feed so they don’t have to update the feed.

I’ve read something about rewriterules but I don’t exactly know how I have to use them. The examples given don’t get me any further either.

Let’s say I want people who have https://www.oldblog.com/wp/?feed=rss2 in their feedreaders to see the updates from
https://www.newblog.com/wp/?feed=rss2.

What’s the exact RewriteRule I have to use for that?

And can I just make a new .htaccess file or do I have to use the one WordPress creates when you change permalinks?

Thankies in advance! ^^ (yay for you!)