SB are the only people who can help. They could add a function to their scripting language that would allow the flip to be done early, then use this to add the set SideOfPier functionality to their ASCOM driver. They have control over all of this, no one else can, especially with no early flip functionality in their scripting. They added the ability to read the current pointing state (Side of Pier) so maybe they would be amenable to this. I don't think the probability is high but if you don't ask them they won't know that this is needed.
Chris R