You could try the London Executive Aviation King Airs out of Stapleford. If they can land on 22L at Staplers (about the size of a Platinum credit card, which coincidentally is what you'll need) they shoud manage the altiport.
The problem may be finding a pilot signed off to land at Meribel...they don't let just any old idiot in.
Or you could just catch the SnowTrain and sacrifice the mile-high possibilities.
Bon ski mon ami (is it that time of year already?)
SJ