I think one thing we have to do is to teach how "accessible" these can be.
Paradoxically, photography is always associated with its easiness and technicality at the same time. I do offer beginners classes to introduction to darkroom classes, it would be really hard to find students if we were to cover coating emulsion. Promoting historical processes is already difficult enough to general public.
Though I have to say that people who have taken classes here are getting more familiar with historical processes in general since that is what I do. I show my images in the class casually and also talk about them in the classes. We usually go to galleries and museums in NY to see photography shows to see actual prints. I take all my beginners students to Archive room at Philadephia Museum to show the orignal prints of photographers. So they do get used to seeing them eventually. I want to make sure that they are surrounded by those prints and processes, then they are not so foreign or discouraging.
Once people are comfortable with that level, emulsion coating is one more step ahead of those.
The way we try to promote these processes is the fact that they can manipulate the processes. You can print on different materials to getting different effects. It will bring an element of "craft" to the process and individualize the process. You can change it in any way you like once you understand the process.
So, to me this is a two-step process of getting people used to seeing and hopefully making prints that way.