Currently, CubedCraft does not have any proper packet manipulation using Skript. Skellett adds a packet event, but no clear way to modify the packet and no way to make new/send packets.
ThatPacketAddon is based on the MundoSK packet features, but doesn't come with the other features of MundoSK that might potentially be security risks for CubedCraft.
It also has newer and easier to use syntaxes for packet fields.
The plugin is free, so CubedCraft should have no problem with adding it.
Link: https://forums.skunity.com/resources/thatpacketaddon.847/