I've got an S-works SL in -12, the branding is not very visible so might be a good choice?
Also the Specialized pro set stems have adjustable shims and have some with no branding.
Enve Aero stem is also adjustable stem angle, but not paying $300 for a stem...
Zipp and Extralite. Not much else out there unfortunately. Been looking one for the Moots for ages and nada. T