On its potential as a BUDA course I cannot really comment as the only BUDAs I have attended were Painswick and Hoylake. But in their favour neither Seascale nor Silloth is prohibitively expensive. Both are compact making 36 holes a day possible and both clubs are used to visiting parties playing 36 a day. For those who want to extend their visit to the Lancashire or Ayrshire coasts distances are comfortable. Unfortunately there is not a ferry service from Silloth to Southerness, one of my favourite golf courses.
I know of only two other links courses in Cumbria, Furness and 10-hole Dunnerholme. There are several rugged, hilly courses with a good fun content, such as Brampton, Appleby, Penrith and Windermere. Grange over Sands is a shortish MacKenzie course, but I don't know how much of MacKenzie's work survives.