I can highly recommend feed2exec. It’s super flexible and lets you easily do anything off the back of an RSS feed item. This way you can abstract away the matrix side and write a minimal matrix plugin to send to matrix rooms, but you can also do anything else you want within the same framework.

I use it to:

• Save RSS feed entries as plain-text files, so I can read them in less
• Download podcasts, running a pass of ffmpeg over each to reduce file size
• Watch releases of open source projects and add a task in taskwarrior for me to review and/or update them