Well Dave, be prepared to be shocked.
While i have certainly found passing mention of gonjo iras it is usually just to say something like, this blade is "gonjo iras meaning that it was formed in a single piece with the blade" (The Invincible Krises, pg 104). Never have i come across an explanation for this form. While i appreciate the inclination towards laziness (i am a card carrying member of that club myself
) i am afraid that "chapter and verse" would be really handy here. I am also afraid (much to my chagrin) that i have not had the opportunity to pick up any first-hand information taking with people around the archipelego, but those i have discussed this subject with who have had that opportunity (the dreaded second-hand information
) have not come to your conclusion. Though i don't necessarily agree with this train of thought, it would seem that the popular mystical belief of today as put forth by Harsrinuksmo would be that keris gonjo iras are not true keris at all. See rule #1 on this website: http://www.geocities.com/javakeris/kerisology.htm
Of course, what is believed true by the mystical community in regards to keris today is not necessarily what was believed last century or the one before that or the one before that. Still, i would like to find at least a single written reference that directly addresses this subject.