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Get al-Fiqh al-Manhaji by Mustafa Khinn, et al. It is in three volumes and is very easy to read. It is essentially an abridgement of Mughni al-Muhtaj and is designed for intermediate and high school Arab students.

I disagree with the view that evidences should not be taught from the outset. I taught fiqh to eleven and twelve year olds in England last year and mentioned the hadith alongside the masa'il. The kids were not confused at all. In fact it increased their desire to learn more. In this age, one needs to be confident that madhab-based fiqh has a close relationship with the sources. The Shafi'i madhab has a special relationship with hadith and fiqh is not fiqh if it does not have a connection with its sources. Anything less is simply ma'rifat al-masa'il. It is distasteful for an alim or student of knowledge to not know the evidences for the masa'il when asked.

There is a great sharh of Umdat al-Salik by Alawi al-Saqqaf that is full of hadith referencing. It also mentions the eighty or so instances where Ibn al-Naqib went against the mu'tamad positions of the school. Unfortunately, this book is very rare to find, though I do believe copies of the manuscript are at Umm al-Qurra. Mustafa al-Bagha (who co-wrote al-Fiqh a-Manhaji) has a sharh full of hadiths too and his is much easier to find (it's also easier to read).