[stevenwalton]

Sure, but this doesn't really scale very well. Distributing those APKs without internet access is pretty hard.

[eredengrin]

Briar already has this built in via the "Share this app offline" feature. It starts a wifi hotspot from which people can download the apk.

[folmar]

Also Fdroid has support for local distribution and discovery for offline scenarios.

[ruined]

you can distribute it via the same mechanism which distributes your messages