After using autometer electonic speedos I don't bother fooling with the factory stuff. Just follow the instructions, wire the speedo to the VSS output and drive a mile. Super easy and you can recalibrate it when you change gears or tire size.
I spent a few days looking around and haven't found anywhere someone got a mechanical speedo working with a 4R70W. I think you are going to be stuck going aftermarket.
The only way you will get a mechanical speedo on a 4R70 would be to swap the output shaft and tailhousing from an AOD or swap a cluster and and related electronics from the donor vehicle. For the expense and pain either would be, it would be much easier and cheaper to go aftermarket.
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