A couple of good ideas there, the mosquito racquet is a real Made in Taiwan product alright. Could it be adapted to work with houseflies
. I don't think Chou doufu will be taking the world by storm yet but you never know, Africans might have a taste for it or something.
As for the cloth masks, I think they have the same things in Western countries, no? At least they may have but probably pretty expensive, I think you mean the one with collagen in it. I have a male friend (ahem) who used one before and it does feel like it does something and pretty refreshing when it is hot as hell. I checked online and there are hundreds of suppliers in China. Maybe it has import regulations although I doubt it is very regulated. The refrigeration aspect is a good twist from a marketing point of view.
A couple of other ideas are bamboo activated charcoal textiles or non-sweat t-shirts, Taiwanese seem to have invented a lot of that stuff.
Other food stuffs that might go down well are different types of vinegar and longan honey.