plating a brazed brass-ss component

I have a brass component (watch case center) with 4nos of SS (304 grade) inserts brazed on to it. The brazing is done by using a Ag-Cu-Zn-Sn Brazing paste from hilderbrand and passing the component through a furnace at 630 deg centigrade. Our Plating process is Nickel Electroplating followed by Ion Plating of Titanium & then Ion Plating of Steel/Gold (as per the aesthetic requirements of the component).

The problem encountered is in plating - Nickel Electroplating. As SS & Brass have different pre-cleaning processes, either one of the materials is not getting activated for plating in the other's pre-cleaning solution.

Since the bulk of the material is Brass we tried the pre cleaning in the Bath suitable for brass. The SS inserts do not get activated and as a result, the nickel layer starts to peel off which finally results in peel off of the top most gold or steel layer.

Pls suggest undercoats that can be substituted for nickel or a pre-cleaning bath that will activate both metals or any pre-brazing coating to the SS component which will withstand the brazing temperature & make it inhert to the Brass pre-cleaning bath & can be directly subjected to Ion Plating (Actually SS does not require Nickel under coat, only Brass needs it)