It probably can technically be re-purposed, but unlikely to happen as it does not exist as far as I am aware on the Openreach price lists.
In short would be a custom job, something Openreach are not good at.
Presence of it might mean Ethernet is cheaper to install, remember also that with Ethernet usage is a lot less of an issue. Potentially if others are looking for connectivity on the estate you could partner up to get a big connection and share it out yourselves.
Alternatively if other cabinets in area have FTTC and not yours find 50+ people with a firm commitment to buy service and you might convince Openreach to enable it.