From time to time aircraft inbound to us use the Dundee ILS and break off at low level when VMC. They need to know the low level route from there as direct will not usually work .
The same is possible at Leuchars but again the low level route would need to be planned in advance. They are also able to offer a cloudbreak over the sea.
Leuchars are no longer 24/7. I don't know if they switch off their navaids.
D.O.