It is wrong. First, "ikisi de" is in the nominative case and would be used as a subject.
Secondly, "ikisi de/ikisini/etc" is really just used when you have "two things" and you like both of them. It is also formed using a genitive construction (notice the -si on iki"
For example, "erkeklerin ikisini de seviyorum" -- "I like both of the guys."
I guess you can say that "ikisi de" is used for a set of two specific things while "hem...hem de" is for just listing two random things.