That is so great to hear,............ that it is possible........ can you give more details? how do you do it well??? My only problem with single mating is that the birds in cages don't get to scratch and dig and look so beautiful doing it, but I guess they can if their pen is big enough. So how does the little guy make a difference????????
The guys I know that do small matings typically don't let the birds range much or at all during breeding season. A 4'x4' pen is just fine for a breeding pair, for smaller large fowl or bantams I know plenty of folk that even use the larger dog crates (like great dance size), heck I'm a big fan of those for conditioning birds before a show but that's another topic.
Again though to be successful on a small scale you need to keep excellent records. Toe punching, wing banding, whatever, you need to be able to know each birds parents, grandparents, great grandparents etc. Because you need to know what traits each bird individually passes onto it's offspring. Basically you run it more like a dog breeding program or horse breeding program, keep your pedigree, track what each bird tends to pass on to it's young both good and bad. That's how the people I know that keep it small do well.
The other part of being successful on a small scale is culling ruthlessly. If you hatch only 25 birds, keeping more than 1, maybe 2 shouldn't happen, you can't afford to have birds in the flock that are less than the absolute best produced. Some of these breeders I know that only hatch a few birds have had years where they don't keep any, but go back and change last years matings (because they obviously weren't good ones). If I were to follow this strategy I would keep only the best singular bird of each sex per year, and breed them back to a parent or grandparent that produced offspring with strong traits where that bird had weak points.
Then again, what do you mean by "making a difference"? If your goal is to improve the breed for yourself and maybe another person or two, easy. If your goal is to produce birds that do well at shows without hatching a lot, little bit harder but easy. If it's to help make a breed more widely available and "save it from disappearing" or similar, then that is never going to happen on a smaller scale, it just can't because the numbers aren't there. Now you could do one of the first two, then find a breeder that raises on a larger scale and get them started, which would be a good way to contribute to the hobby as a whole.