Hello gschill
Thank you for your query.
I will try to answer your question in the right order.
1. Yes, it is possible to send you Ski baggage from the airport in Zürich to Zermatt. If you send it on your day 1 before 7pm they will arrive in Zermatt on day 3 in the morning (9am).
2. There is no problem for the pick up one day later in Zermatt.
3. The Ski baggage are allowed in the Glacier Express.
4. No, we do not offer any Express Offer to be able to get your ski on time in Churwalden
I hope I could help you out. Our RailService (+41848 44 66 88 open 24/7) will be glad to help you out if you have some further questions.
I wish you a nice stay in Switzerland.
Greetings,
BrendaD