Do you know of any books that help Sephardic readers with the Mishnah Berurah (i.e. by telling them when Sephardic Poskim hold differently)?
The Ish Masliah version would probably be what you're looking for. It brings when the Kaf HaHaim disagrees with the M"B, when Hacham Ovadia and also Rav Moshe Lewi disagree as well. As well as many other great features
Here it is online for around 90$.
There is a new Mishna Berura Tiferes Hamizrach - with all the Sefardi Poskim - published by Zundel Berman. So far it is only available on Hilchos Chanuka from volume 6, however the author is planning on doing the entire Mishna Berura over the next few years.