Is there way to do this? Can the push button shifter be adapted to a later trans and a 727 at that?

Yes, but it is not trivial. See here. Very expensive. Better to just go ahead and build the twin-cable transmission you need/want.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

OUCH!...lol. Time to rethink.

I don't know what is going on at Imperial. This June it will be one year that I ordered and paid for cables and never got them. They don't answer any e-mails and when I finally got someone on the phone I was told that my order was on the emergency "Hot List". More digging and I found out that the cable housing supplier has gone belly up. I doubt if I'll ever see them. Still,I hope they will come through.

email is useless I have never managed to get them to answer an email (8 month now).