UNC is fine with an SSIS job as parameter for package or project

SSISUNCJob.sql

USE [msdb]
GO
DECLARE @jobId binary(16)
EXEC msdb.dbo.sp_add_job
    @job_name = N'MarkV'
,   @enabled = 1
,   @notify_level_eventlog = 0
,   @notify_level_email = 2
,   @notify_level_netsend = 2
,   @notify_level_page = 2
,   @delete_level = 0
,   @category_name = N'[Uncategorized (Local)]'
,   @job_id = @jobId OUTPUT
SELECT
    @jobId
GO
EXEC msdb.dbo.sp_add_jobserver
    @job_name = N'MarkV'
,   @server_name = N'localhost\DEV2012'
GO
USE [msdb]
GO
EXEC msdb.dbo.sp_add_jobstep
    @job_name = N'MarkV'
,   @step_name = N'Test'
,   @step_id = 1
,   @cmdexec_success_code = 0
,   @on_success_action = 1
,   @on_fail_action = 2
,   @retry_attempts = 0
,   @retry_interval = 0
,   @os_run_priority = 0
,   @subsystem = N'SSIS'
,   @command = N'/ISSERVER "\"\SSISDB\SO\VarigenceForums\markvsqlishandsomeandwitty.dtsx\"" /SERVER "\"localhost\dev2012\"" /Par "\"$Project::PkgUNC\"";"\"\\localhost\ssisdata\"" /Par ParamUNC;"\"\\localhost\ssisdata\"" /Par "\"$ServerOption::LOGGING_LEVEL(Int16)\"";1 /Par "\"$ServerOption::SYNCHRONIZED(Boolean)\"";True /CALLERINFO SQLAGENT /REPORTING E'
,   @database_name = N'master'
,   @flags = 0
GO
USE [msdb]
GO
EXEC msdb.dbo.sp_update_job
    @job_name = N'MarkV'
,   @enabled = 1
,   @start_step_id = 1
,   @notify_level_eventlog = 0
,   @notify_level_email = 2
,   @notify_level_netsend = 2
,   @notify_level_page = 2
,   @delete_level = 0
,   @description = N''
,   @category_name = N'[Uncategorized (Local)]'
,   @notify_email_operator_name = N''
,   @notify_netsend_operator_name = N''
,   @notify_page_operator_name = N''
GO