I'm not sure LSGG will put out said NOTAM this year and it is extremely rare LSGS would be closed for weather in winter but it might obviously happen.
All depends on what you are flying but LSGL might be an option. Otherwise I would suggest you plan north all the way to LSZH (where you'll have full range of ground support & transport, CAT III, etc) or south , ie somewhere in Italy - places such as LIMF, LIME or LIMC.
Incidentaly I believe both Bern and Annecy are CAT C.
Last edited by zambonidriver; 11th Oct 2022 at 12:05.