No, Henry, it is not permitted. Article 53 says that even those who are licensed to exhort or otherwise given permission by elders to lead in worship (but not ordained) must "refrain from all official acts of ministry." The greeting or salutation is considered to be such an official act. This was recently confirmed by Synod 2001 when it said that "certain acts of ministry -- among them ... the pronouncement of blessings for the people, ... -- are part of the ministry of Christ to his followers and are entrusted to the church and, within the church, to its ordained leaders ...." You may wish to read up on this in my new CR Church Order Commentary at both Article 53 and Article 22.
If an unordained person leads in worship, it would be entirely permissible for such a person to change the greeting to a prayer. "May the grace of our Lord Jesus Christ, the love of God, and the fellowship of the Holy Spirit be with us all." It is then not a pronouncement from Christ to his people, but a prayer of the people to Christ.
I hope this helps you.

According to church order, is it permissible for a lay person i.e. not an elected elder or deacon to bring God's greeting at the start of a worship service?