Pierre Samoens has a fairly short season basically corresponding to July and August.
As per above the PPdS (last June weekend) is when the full PdS system opens with all the links with Les Gets and Morzine open a week or two before and weekends only earlier than that.
As above we have been a number of fimes mid June with the trip finishing with PPdS
OP the magazine (issue 91?) had an out of season big day out utilising only the Champery Cable car which runs for longer than other lifts, basically Morzine ride up to Col du Coux (800m climb ?) down into Champery, cable car up, another pedal up to Col PdS (given region its name) then along and down to Lac Montriond (trail called Monkeys Arse ?) and back to Morzine. Can email you some more info if you wish. Also Les Gets Samoens ride you can do with a cab back or leaving a car in Samoens.
The lifts in Metabief in the Jura open in May weekends only.
Chamonix is usually open early/mid June and more options there before bike ban in July/Aug