There is a bit more legal opinion here in which the author opines that
quo warranto won't work, but Trump should file for a declaratory judgment:
Former President Donald J. Trump Should File a Declaratory Judgment Action and Not a Quo Warranto Action Since challenging the validity of certified presidential election by the Congress has never before been attempted, it is difficult to predict with certainty what the courts will do. They have refused to do much of anything so far. Yet, there are still cases pending at SCOTUS.