Has anyone actually successfully requested a copper rearrangement for an EO line?
They will do it for a bunch of lines if BDUK or similar fund it, but not for individual lines.
Yes, copper re-arrangement is done within BDUK projects, but it really does require work to plan and coordinate (there are potential crosstalk issues, that can affect other homes).
I have certainly seem it happen here (North Yorkshire).
It is likely that the work would have to be done for all homes on a DP, rather than just an individual home. And possibly multiple DPs.
I recently found some history of the FTTC upgrade in Nocton, Lincolnshire. That upgrade included some copper rearrangement (not EO, but a similar situation), but it looks like it took rather a battle to get done.
Take a look here:
http://nocton.blogspot.co.uk/search/label/BT%20Openr...
If you want to read chronologically, use "Older posts" to go back to March 2016, and read from there onwards. Look for references to either "Pillar 3/2 Metheringham" or "Cab 17 Metheringham".
You'll see that cab 17 was being installed to service a PCP that was originally secondary (aka a "pillar") 3/2. The houses that need re-arrangement weren't connected to 3/2, but went direct to PCP (primary) 3.