Unless I'm mistaken, the BDUK projects like Superfast North Yorkshire plan primarily at the cabinet level. Whilst they might be aware that there are some D side pairs on your cabinet that are so long FTTC will be essentially useless, I doubt they're targeting funding at those lines.
Cornwall used some of their BDUK funds to provide FTTP to remote properties. MrSaffron will likely know more about the Cornish use of FTTP.
It is certainly worth enquiring with Superfast North Yorkshire if they are able to do anything to help you. Make sure your enquiry underlines that your line connects via an FTTC enabled cabinet but the long line length from the cabinet made the FTTC service you had installed too slow to be of any use.