The ideal alternative would have a “slated S” (as the Bremen one) but will not have the different stroke widths within the same letter (i.e. I'm looking for a more uniform stroke in the font like Helvetica). Here is an example of the Bremen Bd BT Font:
I tried a couple of online services (Whatfontis.com, whatthefont.com, identifont.com) without finding anything suitable.
NOTE: The recommended font can be commercial. I'm not a designer but I'm trying to help my team to choose a font.