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No, thats not how it works. The OAO has to find the paths (normally via a consultant if they dont have their own planners) and NR tells them if they work or not. You can flex only if those flexes work and aren't detrimental to performance.
Hours of operation aren't going to be more than 2330-0530 at best. I still don't expect more than 8tph through Handsacre off HS2, even that might be a push depending on how its timetabled and yes, there should be northbound out of Curzon St. Turnarounds no less than 15 minutes at OOC. Splitting...
Chances are that requires more disruptive time, which the access may not get, and secondly it costs money where the view would be its better spent on something else.
As for LUMO, they wouldnt have the stock and splitting/joining a Scotland service with one from Wrexham is going to be as relaible as a chocolate fireguard.
You would have a set of blockades. Overnight closures would be ridiculously inefficient and the only set times Basingstoke to Reading is closed is for 8 hours on a Sunday morning. That is probably 4-5 hours tops working time in reality.