Conversations recently started supporting UnifiedPush in v2.12.0! The founder of Prosody also made a module to support UnifiedPush, compatible with Conversations. Conversations is a Jabber/XMPP instant messaging client for Android which can also act as a UnifiedPush distributor.
License: GPLv3 Sources: https://codeberg.org/iNPUTmice/Conversations Server: Your XMPP Server with a Rewrite Proxy Technology: XMPP Download for Android: Set Up Android Client Open Conversations Settings Scroll down to UnifiedPush Distributor Select the XMPP Account you want to receive notifications through You’re ready to use UnifiedPush!
https://unifiedpush.org/users/apps/
But I guess there are some more.
how would I as a user set one of these apps up to use the conversations UP?
https://f-droid.org/2022/12/18/unifiedpush.html