This has been done a 100 times before , and yes , I agree on your comments regarding being stuck half way up the limpopo and losing your licenses . One of the things that puzzles me slightly is that people go to places like this without worrying about backing up their operating system , or program files .
My solution is a USB harddrive with a couple of images of the laptop harddrive - One clean with no operating system , and one with all my software installed , but no junk . I reckon that I can get back to running in under an hour if I have a problem .
I won't go into backing up of keydisks - unless you have the ability to run pure dos , a lot of the software won't work , but if you do possess a genuine license , there are many simple ways that don't require too much thought that allow the user to make an image of their license - not their license diskette - I would also agree that I have always found AB and Siemens pretty fair (so long as you can contact them) with regard to license recovery .
I think siemens have done the right thing with offering a slimmed down version of S7 for download - it is enough to allow full functionality without networking , if anyone needs more than this , then it is for a commercial job , and I don't care where people are in the world , the job is worth the same .