That looks great! I ran into a couple of feed generators when I first needed this myself, but they were either paid or clumsy to use. That's when I thought, "alright, I can build this myself, and then I can even use CSS selectors, since I'm comfortable with those anyway". Of course, that is the point I should've thought about explicitly searching for one that supported that :)
Ah well. What I do like about my current approach is that I have full control without having to run my own server, which is nice.