[Standards] Encrypted peer-to-peer XML channel

Hi folks, I've been brainstorming a mechanism for offline history transfer (i.e. one client fetches the offline message history from another client). For that, an encrypted direct client-to-client XML channel would be neat. 1. Are direct client-to-client XML channels a thing? I found XEP-0247 [1], which looks alright on first read-through but is deferred since 2010. Does someone more familiar with the topic know why the XEP was abandoned and whether it could realistically be revived or if there is a better alternative now? 2. Are encrypted direct client-to-client channels a thing? There is JET [2], but it seems to focus on key negotiation (which I would do differently) and file transfers, which I don't need either. I don't see how a bidirectional data channel/stream would be encrypted using JET. There's also a XEP called jingle-xtls [3] in the Inbox, but it's even more abandoned than XEP-0247 and also seems to focus mostly on the key negotiation, which again I would do differently. Next to these questions I would be interested in the general sentiment and ideas for workarounds (e.g. "p2p is cursed, just send encrypted stanzas via the server as usual" or "just use a simple binary format and don't bother with a fully fledged XML stream"). Thanks :D Tim [1] https://xmpp.org/extensions/xep-0247.html [2] https://xmpp.org/extensions/xep-0391.html [3] https://xmpp.org/extensions/inbox/jingle-xtls.html