Alpina has quite narrow shoes and if your foot isn't narrow...I know the problem. They pass, really. No piece of gear is so hard to buy as shoes-any kind!
I myself have 40-40.5 size too. And almost no sneakers, shoes, boots in that size. All bigger also 42 and mostly men's models.

From brands at me you find Merrell, Dunlop...At me you don't find Alpina, Salomon, Nike. Gave up on their models.
Descent though good lacing technique and what comes with practice-good step. Myself only now getting to better leg, foot placement on descents and finding better lines. Before just landed with foot like a cramp, wasn't nice next day.