A secondary option (for anyone else reading this thread in a similar circumstance) would be to save a new (empty) project with the default settings for your master pages. Whenever starting a new project you could simply open this “template” project and immediately “save as” with the true intended project name and go from there. Any edits you would make would be to the new file name just assigned and not the original master “template” file you created.
In the future, yes, you will be able to import and export various settings between projects. I hope we’ll be able to at least get some basic support for this into the update to follow the upcoming 1.1 update, all being well.
No news at the moment, but if you have need of making a particular set of master pages from one project available in others you create, the simplest way to handle it for now is to use Save As on the project that contains the master pages you want to use, then delete the flows/players from that project, and finally do File > Import > Flows to import flows from another project, which will then assume the settings (including the master pages) of the project you import into, rather than the original project’s settings.