DUS would be a reasonable choice for another German destination. LH have a 'mini-hub' there, with long-haul out to a few select locations.
However, as part of their re-organisation, the only LH short-haul routes from DUS are to FRA and MUC - everything else is transferring to Germanwings (4U), so it doesn't seem like an obvious alternate European hub destination.
On that basis, DUS would have to largely work on point-to-point traffic. Maybe the filing really is for QLA, and this is a private route they're looking to operate? (I see there's a Boeing maintenance company based at Lasham Airfield?).