You do not say how wide the wide patterned band is, relative to the
bezel. If the band is wider, you can drill through it, and solder the
tube setting into the band. If the band is to be split, any tool you
can force the split open with works, and then prefinish the band and
the bezel before soldering them together. For a split look, you could
also start with awider band, saw out the split look area, and then
trim the shank, and again, prefinish it before soldering.
Many ways to approach this.