Pity about your location,I have a very nice Walther lg 300 we may have been able to px your super air against.
My advice if your buying new and can afford it,go Feinwerkbau p800,I have one but converted for field target.you could be deformed but still get the gun to fit you,there's so much adjustment on it.
In saying that the Steyr challenge is awesome,the electronic trigger is unreal.If I can get my eyes and back sorted that will be my next purchase.