A Workaround on Formatting the String returned by RAISERROR

Problem: 

when I run anyone of the three below, the returned string in not formatted as desired.

--Option 1

RAISERROR ('Error in % stored procedure', 16, 0, N'usp_InsertCategories');

Msg 50000, Level 16, State 0, Line 2
Error in usp_InsertCategoriestored procedure

--Option 2

DECLARE @message AS NVARCHAR(1000) = 'Error in % stored procedure';

RAISERROR (@message, 16, 0, N'usp_InsertCategories s');

Msg 50000, Level 16, State 0, Line 2

Error in usp_InsertCategories stored procedure

--Option 3, in SQL Server 2014

DECLARE @message AS NVARCHAR(1000) = 'Error in % stored procedure';

SELECT @message = FORMATMESSAGE (@message, N'usp_InsertCategories');

RAISERROR (@message, 16, 0);

Msg 50000, Level 16, State 0, Line 4

Error in usp_InsertCategoriestored procedure

Notice there is a space and an 's' missing between usp_InsertCategories and stored procedure.

Workaround: 

RAISERROR ('Error in % stored procedure', 16, 0, N'usp_InsertCategories'' s');

Msg 50000, Level 16, State 0, Line 1

Error in usp_InsertCategories' stored procedure