IIRC, there should be a double backslash for the share names
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sqlcmd -E -S $(ESCAPE_SQUOTE(SRVR)) -d LL_DB -Q "EXECUTE [dbo].[DatabaseBackup] @Databases = 'AVAILABILITY_GROUP_DATABASES', @Directory = N'\\backup\SQL\Drive1\,...

You can use BCP to export the XML to the file system
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Quick suggestion
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USE TEEST;
GO
SET NOCOUNT ON;

SELECT
  OBJECT_SCHEMA_NAME(SCOL.object_id) AS SCHEMANAME
 ,OBJECT_NAME(SCOL.object_id)   AS TABLENAME
 ,SCOL.name         AS COLUMNNAME
FROM   sys.columns     SCOL
INNER JOIN ...

Here is one way of doing this
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USE TEEST;
GO
SET NOCOUNT ON;

CREATE TABLE #UserActivity (
[User] int NOT NULL,
ActivityTime datetime NOT...