I've found this conversion tool:
https://github.com/pelletier/dailykindle
It converts feed urls into mobi files. Could somebody please help me compiling this stuff for running directly on Kindle Paperwhite? It requires python 3 to run
Then I'will take care of the KUAL app that runs the script, download and convert the feed to a mobi book and display to the user whether the operation has been successful or not, etc.
Thank you in advance