i was able to get LANDesk profile migration working using USMT as well. However, my method was to substitute SMA with USMT and have the profile migration templates work as as designed including machine mapping. This means I am able to use "Launch Template" in my capture template to automatically create the migration task that migrates the captured profiles to the target machine.
Of course, you can still capture the profiles as a stand-alone task and migrate them later, after mapping the machine in "Machine mapping".
of interested, please let me know and I will let you know how it can be done.