The committee would facilitate communication, helping to distribute information to members, collecting input, and developing membership position on issues. In its first incarnation, such a committee would have only interim status. Its ability effectively perform its function would be reviewed, and the appropriateness of its initial participants reconsidered. The first ICCC might continue for just one trimester and then be revised or formalized in a subsequent meeting. This would be a list of some of the substantive topics most important to the At Large Membership.
Facilitation is distinct from representation.
I'd suggest to first define the functionality, then list some requirements derived from that functionality, and finally come to implementation issues such as possible nomination of ICC members on the Members' Forum. In the functionality section, you should define more clearly with whom the ICC would communicate, and what that communication looks like. So, this should rather be phrased as an agenda for the At Large public which the ICC should help to work through. Further clarification of the proposed role of the ICC seems to be necessary. The ICC members need to be trusted enough to provide and handle information and means of communication in an unbiased way, but there is no way the ICC can assume the role of a preliminary At Large Council without At Large member legitimation.