Ah, amazing – I didn’t even consider that changing the command name could have an effect, but it does (I thought it was about text preceding the command):
namespace\fshyp{}container
[Para [Str "namespace",RawInline (Format "tex") "\\fshyp",Str "{}container"]]
namespace\aaa{}container
[Para [Str "namespace",RawInline (Format "tex") "\\aaa{}",Str "container"]]