Can I use a verb as an interrupter?
For instance, if I would like to mean:
He is said to be leaking secrets
can I also express it like this?
He, is said, is leaking secrets
No, but it can be expressed like this:
He, it is said, is leaking secrets.
For every verb with tense, there needs to be a subject. Both instances of "is" are conjugated verbs, so they need subjects. It's not clear in your sentence whether "He" is the subject of the first or second "is". I guessed the second, and inserted a subject, "it", for the first.