Actually, I feel certain that remortgaging would be okay aslong as it was done ahead of time. I mean, what if you decided to move house, and took out a bigger mortgage on a similar property? Would that be classed as a loan that might affect the application? Surely not...Food for thought and reason for more optimism.
If I was in such a position then this is the type of thing I might look towards to help get me over the line, as it were.
See what the "grown ups" on the forum think....