Brian's idea is actually pretty good, it will only make the front fork to be lower only half an inch, but i just got back from measuring some stuff and B/pro necks are 35mm wide and micro foldys are 31mm. Unless you would grind down 2mm from both sides of the razor neck (which will make it weaker also), then it doesn't fit.
edit.
It might work if you would only grind down the part where the razor neck goes between the gap, rest of the neck can be untouched, just weld it and it could be pretty strong. Just for reminding, there could be some problems installing those reinforcements because they need the two front bolts of the foldy.
edit.
It might work if you would only grind down the part where the razor neck goes between the gap, rest of the neck can be untouched, just weld it and it could be pretty strong. Just for reminding, there could be some problems installing those reinforcements because they need the two front bolts of the foldy.