Challenging is better than impossible.
That said, I am left wondering why more major software publishers don't have the option to sideload Android apps. (It was a while since I looked into it, since I mostly use open source apps these days, but it seemed as though most companies were switching to a Google Play Store only route a few years back even though they had the brand recognition to bypass Google's store altogether. The only thing I can think of are support costs, since few people would know how to enable the ability to load apps from other sources.)