No a dd won't work on a notice account.
You can't buy by bank transfer, last year when I wanted to buy a large amount (not nearly as big as yours but big for me!) the only option was to get a bank draft. Helpfully UB would not issue a bank draft to NTMA/An Post or whatever it said on the form because I could have lost it outside the door and someone else found it and used it! Possible I suppose. The CU next door to them had no such problem so I just posted off the application and the draft, you could also go to the local post office with the form and draft if you don't want to post it.