As a lot of people asking me about it, I announce that I'm already working on a replacement power supply for Neo Geo CD and CDZ.
The board is completed and I have choose the plastic case.
I just need to finalize the cable and the plug but it should be ok.
The product should be available this year.
Update 11/10/17 - I had to scrap the plug completely to have a more easy-to-make plug, it was working but a pain to assemble if too many, I think I have find a good solution. It is not my main project and I have other spending at the moment but I will try my best to make the product available before the end of the year.