That makes a lot of sense. Depending on how the patterns layout, maybe offer it as an either or both option in case someone wants the option down the road (start with a 727 but swap to a GM trans later).
And I would guess that it wouldn't just be racers that would want that. Seems like the 4L60/65/80 is a pretty popular trans, or even the 200R4, so I could see it being a popular option for an G3/4L65E. Unless the 8HP70 because easier to swap.