Haven't check but the outlet side of the existing dump valve might be a standard mount, You could add the electric dump valve in series with that and maybe avoid messing with the Thetford itself. Another option is to add another dump valve either manual or electric directly under the TM in the 3" dump line for the Thetford. It would mean a slightly larger initial charge, but the small amount of water ( etc) in the connecting piece should not effect operation. Only concern is it is not in the TM itself and might freeze if you do a lot of cold weather camping.
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