I think they have it more or less sewn up, and if you got their luggage from anywhere else it'll probably come through Moto-Bins anyway.
Have a long weekend to the Hotel Forsthaus in the Eifel, have a ride to Wunderlich and buy direct.
Ferry crossing Dover - Calais for about £35, two tanks of petrol £20, two night evening meal bed and breakfast, with beer, probably about £75, say another £20 for other food, coffee etc. The H & B will be cheaper over there anyway!
About £150 quid and you'll have a fantastic time, ride some great roads, and will have had a break cum holiday