Hello Zearrewi62
No, this is not possible as you will be in need of a ticket for the Geneva to Zermatt route.
You either have to trust on a private baggage transport service specifically for Haut Route hikers, there are quite a few of them, but, from personal experience I know, they are not cheap.
Swiss Post also has an offer for bulky goods transport:
https://www.post.ch/en/sending-parcels/bulky-goods
What concerns the railway, the cheapest option would probably be the purchase of a Supersaver ticket, or a Saver Day Pass, from Geneva to Zermatt which you ultimately won’t use; yes, it is sunk costs yet might be cheaper than a private baggage transfer service. You can choose any departure time in the day, whatever offers the lowest ticket cost (full fare tickets if you will not have the Swiss Half Fare Card).
https://sbb-tickets.cc/en/tickets-offers/reservation-luggage/checking-taking-luggage/station-to-station.html

Kind regards,
Rland