First, let me state that I am not a transmssion specialist. The procedure by Gil was posted by a specialist. I don't remember a response by him re this specific question. All I am saying is that if there is a large amt of particulate deposits accumulated which as a result of being loosened by the Ford A/T fluid enter the system, you could be in for blockages. Likelihood unknown, but something to be considered. I would not wish someone to try this on an A/T which has 80,000+ miles (and never been serviced) and then have the member report back that the A/T has now "bought the farm". Caution is the watchword.
Forget the Dexron. The point is to drain out the old and replenish. Only use the Dexron if you use SmartBlend. My recommendation is 12qts of Honda A/T fluid (3.5 x 3) purchased at your local Honda dealer. This is the easiest route. Perform the 3x drain/refill. You may be pleasantly surprised I was.