The Micro is vastly more expensive to make than the SP and was pretty much a flop, this is why the parts are so hard to find. There are some aftermarket faceplates, but they are rare. All you have to do is hold a Micro and you can instantly tell how much more lux it is.
There was a special faceplate for Super Robot Wars J as a pre-order bonus, and maybe Mother 3 as well. I can't remember.
Didn't Micros all come with a spare face plate (other than the FC version)? It's odd you guys need them so bad. What do you do with systems that don't have interchangeable faceplates?
As for the chargers, the Micro charger is unique, unfortunately. I have an OEM one and a USB one that came with a black and silver Micro I bought at a local store for $25.