It's been now over a week since we moved to Sydney and everything is just great. We're still house hunting but I got a feeling we'll have a home soon. :)
In the meantime, this morning I got a feature request on github to allow AppConstants to interpret YAML files with embedded code like this:
I haven't needed it myself but thought it would be a nice addition so my latest commit does exactly that. Let me know if you find any issues.