Translation of "to interject" into Spanish

If I may be so bold as to interject my professional opinion.

Si me permite el atrevimiento de agregar mi opinión profesional.

It was inappropriate to interject the General Assembly into issues that were the subject of negotiations between the parties.

Es inapropiado interponer a la Asamblea General en cuestiones que son tema de negociaciones entre las partes.

Always wanting to interject, you know, " And another thing... "

Siempre queriendo interponerse, " Y otra cosa... ".

OK, I'm going to have to interject here cos, to be honest, I'm starting to feel uncomfortable and I'm not even the one being manhandled.

Voy a tener que intervenir porque, la verdad, empiezo a sentirme incómodo y eso que no soy yo el manoseado.