Since I still find it covering some ARF foam wings and in some ARF plywoods.... obeche veneer is still made somewhere.

Obeche is very similar to what is called "Luan" over here. (not sure if that is a type of tree, or a type of mohogany... its VERY similar to low grade mohogany) That may make a decent substitute... Where we typically find the Luan is in a "doorskin" (similar to thick "Lite Ply" or underlayment (a bit heavier but about the same thickness as the "doorskin" at appx 5 to 6 mm) plywood.