I'm not sure what you mean by "They do not have a way to manually sync with a cable unfortunately". You have to have a cable to be able to sync to iTunes. Some ePub-reading apps have file sharing enabled. You can just drag the file into the file sharing window of iTunes while connected, and the file will appear in the list for that app. You don't have to use iBooks to read an ePub. I'm not sure if iBooks has file sharing enabled or not.
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