Use spare Android phones as extra SRTLA bonding connections. The same functionality is part of Moblin on iOS.
Make sure to disable energy saving settings in the phone, and allow notifications from Moblink(?).
Join Alpha Testing by sending me your e-mail, and I'll add you to the list of testers. Once added, click this invite link!
APK can be found here: https://mys-lang.org
Discord: https://discord.gg/kh3KMng4JV
Github: https://github.com/eerimoq/Moblink
Relay implementation in Rust can be found here.