Thanks, guys, for the ideas. There are coal mines already in the scenario so I don't want to add extra as a substitute for lead. The ore cargo in the 1.06 patch sounds ideal, but I had been hoping to make this scenario without that patch so it would be accessable to more people.
I don't think I will use cotton or sheep farms, as they would produce loads for textile mills, which in turn would produce more clothing. Rice might be a workable solution, as it is demanded by houses and breweries, which are both locations that I assume would also use lead. Those ideas have me thinking about coffee, as it goes only to houses. And the idea of using a warehouse to turn one of those commodities into goods, which is what a factory would do with lead, is a great one that had not crossed my mind!
So I'll take a few days to think this over some more, but I'm encouraged to know there are some possibilities.
![thank you !$th_u$!](./images/smilies/thanx.gif)
Thanks for taking time to give me your creative ideas.