Re: Tempting but...
10.3 supports Android KitKat. And just about any Android app that doesn't require Google services should work fine. (For obvious reasons Google services don't work - though oddly enough Google Navigator works fine).
Many can be downloaded from Amazon or 1Mobile or similar app stores.
Or if you have an old Android device you can just copy them over via Dropbox or similar.
I have the Passport. Absolutely amazing phone. A few minor annoyances (like Google services) but a small price to pay. And the new voice assistant is pretty phenomenal. Somehow or other it understands my North Atlantic accent with incredible accuracy.