@korina it would be interesting to hear what disadvantages you reckon with. No one is forced to use the download, so I don't see how it can possibly be disadvantageous if you provide it as an option in some remote corner of the website. Unless, of course, someone uses it "by accident", which, however, I think can easily remedied with a simple disclaimer.
If you anticipate that people, despite it being less-accessible and well-labeled, will accidentally use it instead of using the Google Store version, I don't share your concern and I don't see any reason to assume this. 10 years ago, when Android was still young and people didn't know how to install software, perhaps. But not today.