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Lemmy Handshake - Beta release
(sh.itjust.works)
The app that synchronizes multiple lemmy accounts so you can migrate and keep backup accounts across instances, it's opensource and free, currently working in android and windows.
It's in homologation now and anyone can test, any feedbacks are welcome as always.
If you find any bugs please report
Download now
I'm not sure actually
I don't think kbin (excluding artemis.camp) supports API use yet so that'll be a no. Also kbin is different than lemmy (still federated over activitypub but different platform) so it needs to specifically be supported, won't work with a lemmy client.