Where to credit Brussels Airlines flight?

[DoB]

I'll be flying a short-haul Brussels Airlines flight in a few days. I currently have my Miles&More account listed, but with M&M's stingy expiration policy, that's probably a waste (there is no chance whatsoever that I will build up enough M&M points to use within 36 months). I don't have status anywhere. Where should I credit my miles? It's a Check&Go fare - maybe booking class F?

I'm sure this isn't worth much, but if I can do better than M&M, I might as well.

[DoB]

Whoops, I should have posted this to https://forums.dansdeals.com/index.php?topic=43222.660 - I'll post it there, and if anybody can delete this thread (I can't), feel free to do so.