What you just discovered is there are no longer any standards in bike parts. Stronglight 49d crank was shown in 1932, fully marketed in 1934 and manufactured with no changes for almost 50 years. There are currently several copies of that crank being sold still (Sun XCD, Velo Orange, maybe more) and you can get chainrings easily. In fact you can use steel chainrings made before 1932. When marketers want to introduce new and unique configurations every day of the week lots of orphan parts happen. Try not to buy that kind of junk. Often you won't know in advance you have an oddball part, in many market segments you don't even have a choice to buy standard parts.

LBS could spend a lot of time and get nowhere on this one. They see it every day and usually have no good choices. Parts distribution is a train wreck. You could try to contact Specialized yourself. I'd not even know where to look to find if Samox is a real company or a name used once.