Luxemburgish courses (Luxembourg)

Hi,

I would like to learn Luxemburgs as from Sept / October. I know the offer of organisations who offer courses is quite large, but most of them (INL, Prolingua, Ville de Lux) offer courses where you have to go two or three times per week.

As I am quite often abroad for work, I would like to follow a course which is held only once per week.

Any suggestions?

Thanks in advance!