Reading
this forum post I discovered that MSX bus is phisically identical to Apple II bus. So, as an alternative to the 8bitbaby board (which doesn't seem to be available right now) I started to search Apple II stuff in he Internet, and I found the following:
Developed by
LittleJohn systems and sold by
ReactiveMicro, it is a development board for Apple II computers.
It seems that this could be directly pluggable into the MSX slot... except that it has fuses to control the power connectors. These connectors are in different pins in the MSX.
So, hardware experts around here: do you think that this board could be used in MSX computers with some modifications? For example cutting and soldering a little so that the MSX power lines go to the fuses, or something alike.