I asked this question a long time ago with my old account and my very first character. What I was told is that you CDQ to get Sacred Fist and it was a Priest thing not a monk thing which sucked for me because I had made a monk. If I remember right, you have to have the ability to cast divine magic in order to take sacred fist anyway.
I do not know anything about a druid/sacred first but thought Druids could only multiclass with Shifter. Normally a Monk and Druid cannot multiclass at all. Once they leave the druid/monk class to pursue another career path, they cannot return to it. Paladins i though were the same way with the exception of the Champion PrCs.
There's my two cents for ya
![Wink ;)](https://forums.layonara.com/Smileys/default/wink.gif)
I had wanted to make a monk/priest then go to Sacred Fist. The way I had been told to do it was to make a monk, leave the class for Priesthood ... then get a CDQ for Sacred Fist. I got bored with the idea and made a pure priest instead leaving the whole Sacred Fist for someone else to figure out :p