Hi algieuk,
I suspect this is an impossible one for anyone else to answer - you're going to have to choose yourself, in the end.
But if you think you meet the criteria for an award of DLA, then probably the simplest solution is to make an application.
Trying to figure out all the possible permutations of what happens if you do/don't get an award of DLA and how this might affect your migration which may/may not happen on time is probably too mind boggling to attempt.
Good luck,
Steve
Nothing on this board constitutes legal advice - always consult a professional about specific problems