I too am interested in updating Sacred Fist for 3.5E.
Clearly it will need quite a bit of work. Previously, the puissant fists and no shadow blows abilities were a staple of the class. Since it scaled up as you gained levels in the PrC, and because of the tiered DR system, eventually you would get to the point where you could easily overcome all non-epic DR.
But now, that isn't the case. Since Sacred Fist basically requires you to give up all other weapons, attacking creatures with a special material DR or alignment DR (not DR X/Magic) will be a problem, since a Sacred Fist will not be able to use other weapons without losing class features.
So Puissant Fists will have to be completely changed -- probably into DR-defeating abilities like the 3.5 Monk has.
Flurry attack should probably also get upgrades like the 3.5 Monk has for Flurry of Blows.
Also, the unarmed damage progression should probably be revised to something similar to the 3.5 Monk.
No Shadow Blows can probably stay as it is, since at that point you are effectively getting your Wis bonus as an enhancement bonus on your unarmed attacks.
Most of the other class abilities can probably stay as they are, although as I remember. the SR gained from Inner Armor was pitiful.
I'd be interested in attempting a conversion.