QuoteIt is not on my to-do list at the moment, but I could look into it once all issues with the port are solved. The 6D is the only camera with a built-in GPS that is supported by ML. The 7D Mk II has one as well, but is not supported by ML (yet?). Therefore we should maybe go for implementing all the GPS related features in a module. Maybe some features can be used from cameras with external GPS support as well.
Great news for me. I am not a developer but could I help you concerning this? E.g. with Testing or other things?