I have a solution that might sound weird but may be possible. Bgp GR can run triweekly provided it runs 2 days upto BGP and 1day upto Pnbe only. Say on Monday and Friday upto BGP and upto Pnbe on Wednesday. 22406 on wednesday if late say by 2 to 3 hours run upto Pnbe would allow it depart ontime as 22405 on thursay, and 22406 on friday will be timely conditions apply.plus Sunday buffer will allow time to coverup delay.