I'm not sure that reimplementing a Willem programmer would be a worthwhile commercial effort. The Willem can program a very long list of different devices. I'm not sure that anyone could match its broad support of various programmable devices for under US $40.
I am not sure where you came up with a "commercial effort". I have no intension on marketing and selling it. It is simply a project for a cheap viable modular solution. Great for those do-it-yourself electronic hobbyist (like me). By building one of these it also gives the person a better understanding of how the whole process works. It also allows the do-it-yourself electronic hobbyist to customize it anyway they want depending on their requirements.