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Microphone diaphrams, headphone diaphrams ,dome tweeters, all have to have the pattern applied with a technical pen i.e. Kohinoor or Mars. These are becomming a little difficult to find in all towns. A 50% mixture of Poly S and water should be mixed in the ink storage tank of the pen and a lot of time spent convincing it to flow. Once that part is done they work very well, even on ear buds. For all of you who are interested, the best tools for these pen jobs are teenagers and once they learn how then all of the local boom cars will then become much more effective.....
Sending the white paper off is fine. To treat mass quantities of cone drivers you need just the cones and a made to order, tappered, round lamp shade like tensioned silk screen, that drops in and fits snuggly against the cone with a tiny gap to the screen. Domes need to be silkscreen printed before forming ,if at all possible. If neither of these are applicable to your friends business, then again, teenagers are the answer.