Are these 75+ residents close to each other?
Yes. Our situations aren't really comparable. We're a late 80s development in central London over 2Km from the exchange. Being in London there is currently no BDUK funding to help so after considering various possibilities, not just BT, we signed for BT to provide us with FTTC.
A driving force was both property rentals and values were falling behind those of similar properties in the area most of them having access to not only FTTC but also VM. BTW we are not in an affluent part of London (Lambeth) but the amount each of us has paid is small relative to the loss of value and rents.
I would have hoped that phase 2 of BDUK, in your case Digital Scotland, might address your problem once the easier and cheaper targets have been provisioned.