I actually dusted off my copy of Patterns of Enterprise Application Architecture and there was a chapter on DTOs. In that chapter it recommends using a 'DTO Assembler' which is an type of Mapper - i.e. an intermediary to keep the DTO ignorant of the Models that supply it's data. And this seems to solve the very problem I'm trying to solve, I just didn't have a name for it and incorrectly thought 'factory must be what i need'.
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Drongo_III's post in To factory or not to factory? was marked as the answer