@atlas I have also been hiking up to Roche de Naye (great view) above Montreux, there is a descent you can do using the train as an uplift (bit expensive), I have a map I can send you. More of a one-off ride than Metabief where you can do a few routes off the lifts. Matabief is like a mini PdS with a few custom trails and rooty stuff in the woods. I also did the St Cergue (again train uplift) from behind Nyon where my mate lives but that was a bit boring to be honest.
Chamonix/Morzine is about an hour’s drive in the summer. For something new to PdS you can ride Samoens – get up first lift and ride Les Gets down to Samoens (excellent 1000m+ descent), ride the trails off Samoens lift then have a taxi take you back to Morzine (we booked one with a trailer for 60 euro which could take 4 people/bikes). Contact Bike-Alp and see of they can guide you / help with organization.