Note that the abonné card is valid only on T H and higher fares. CDG ZRH light fare in T is 100.50 EUR + tax per direction and H is 125.50 EUR + tax per direction. So you need to add the buy up to classic (25 EUR per direction) and taxes (30 EUR per direction), so in total 310 EUR round trip at minimum to benefit from the abonné fares and flexibility if our understanding is correct. Add also the cost of the card itself. From CH, it is even higher119 CHF++ for T and 169 CHF++ in H + upsell to CLASSIC.

If you usually buy lower economy fares X/V/R/N/E in LIGHT, even if you loose some return flights, it might end up being cheaper. Hope Air France does not call you back