I bet the shift solenoids operate the same way. Only two of those wires are important anyway.
I'd do it. ...but I'm a dirty boy.
Bad thought! Out! Out!
Also, I bet it wouldn't be terribly difficult to interface the newer TCU. It's not a job for anybody, but a reasonably competent electrician shouldn't have any trouble faking it. Because of the annoying characteristics of the newer transmission, I would opt for adapting the old TCU. I really think this would probably be quite easy to do. I'm pretty sure the newer transmission has a few more sensors and perhaps another solenoid, but I'm also pretty sure they're superfluous. It doesn't have any extra gears does it?