Those components are not really meant for self-hosting, its open to be looked at. You would need to patch out the SIM requirement, point the hardcoded server/clients elsewhere, find some way to sideload modified clients to those using iOS lol, & it’s not federated so you would need a separate app for just this task. At this rate you are 100% better off using a choosing systems where server & clients are actually built with this in mind… Signal’s chat features are not novel