yoo, id probaly use turf, i havnt skiied Dendex but turf works fine. Alot of soap and water and your sweeeet :D
You don't even need to go with turf. Get some cheap carpet remnants or see if a carpet store has some stuff they are throwing away. Also if there is some carpet pad laying around, grap that too. That will make it softer. Put that on your inrun and spray it down with soap and water and you're golden. Low pile would be better probably, but if it's free, you won't lose anything by trying it out.