Sorry to hear of your problem, but maybe I can be of some assistance.
Last week I bought some darkroom stuff from a man who earlier had scrapped a Durst M600, and in one of the boxes I discovered two negative carriers that I believe is from said enlarger.
The crappy phone picture shows the two, and maybe someone in the know can tell if a negative carrier from a M600 will also fit a M700.
One is for 24x36mm and the size of the glass on the other is 7x9cm.
They are of no use to me so you can have them if they are the right size for your needs (no charge).
Just send me your address and I will have them shipped to you.