They're nice, healthy keikis... I recommend leaving them on the parent plant until next year, when the keiki canes are mature and produce a new growth of their own. You can then simply detach them with your fingers and give them their own pot and medium.
Congratulations on your keikis! Your plant decided to have babies while you were gone I agree that leaving them on the parent plant is a good idea until they get bigger and have better roots. The parent den looks like it will be viable for a while, so let the babies be until they easily detach as Andrew said