You gotta be right about the 3B RO. I remember doing a ch 2A+B~iGDR~b2 RO, but if youre near the Edge you gotta be carefull with the iGDR or you gonna RO yourself, watch the Angle etc....but since you have time after iGDR you can take your position for b2 or 22A/88A, which both can Ringout, too.
I often try to iGDR People when im parallel to the Ring Edge and then RO them either with 88A or 22A or b2 whatever. Of course its risky, but if you first go for ch 2A+B, maybe after a b2/44A bait you can minimize the risk.
Either i never did iGDR after ch 2A+B in the past or i just forgot that it connects, but im sure its a "Whooo....WTF!" moment if you RO somebody like that, since you dont have any RO possibilities after 2A+B.