First of all, according to S. 4(c) of the Sexual Harassment Act, 2013, an external member (from an NGO or associations committed to the cause of women or a person familiar with issues relating to s*xual harassment) is necessary to constitute the Internal Committee. In your particular case, you’ve formulated the necessary regulations and established a committee as well, subject to the selection of an external member. Given the urgent nature of these complaints, in my opinion, it should be valid for the committee to take an action on any complaints, as per the law. However, for any decision of theirs to be lawful, I think you will require the presence of a lawfully constituted committee and the same should not be a problem, given your willingness to select the external member (which I assume to be a priority of yours).
As far as the matter of floating the policy for awareness, I think you can go ahead with the circulation of the policy, given the urgent nature of the matter and since its primary motive is internal circulation. Lastly, I suggest you to prioritize the selection of such an external member, as it is a requirement of law.