Star Trek's missed opportunity

When Gene Roddenberry created STAR TREK, he did not shy away from controversy. He hit it head on, especially when it came to race and gender relations. He did miss the mark on one issue - age difference relations.
In the 1966 episode “Miri”, the ENTERPRISE finds a planet that is a mirror image of Earth. The only difference is the decimation of the adult population. The only people left are long lived children who die at puberty.
As the story goes, Miri, who is almost at puberty, gets a crush on Capt. Kirk. Kirk, although loving the attention lavished on him by Miri, is unaware of the crush.
It's not until Yeoman Rand makes him aware that he realizes what's going on.
The only problem with this whole scenario is that “Miri” is played by the lovely Kim Darby who was 19 at the time. Could Roddenberry have gotten a preteen to play Miri? Could he have gotten that past the censors? Did he try?

According to Wikipedia:
“Following the first screening of ‘Miri’ on British television in December 1970, the BBC received a number of complaints regarding the episode's content. The quantity and nature of the complaints were never made public.

Throughout the 1970s and 1980s the BBC chose not to include the episode in repeat runs of Star Trek. Three other episodes from the series were also excluded: ‘Plato's Stepchildren’, ‘The Empath’, and ‘Whom Gods Destroy’.”

So who should have played “Miri”? Here are my choices.

Actresses born in 1956 would have been 10 at filming. I'm sure a lot of old school horn dogs would have privately loved it but would have been outraged publicly.

Maureen McCormick (Brady Bunch)
Carrie Fisher (STAR WARS)
Greena Davis (Beetlejuice)
Linda Hamilton (Terminator)
Kim Cattral (Sex In The City / Star Trek VI: The Undiscovered Country)
Dana Delaney (China Beach)

Actresses born in 1955 would have been 11. Still delectable, still ccontroversial.

Kate Mulgrew (Capt. Janeway of Star Trek Voyager)
Marina Sirtis (Counselor Troy of Start Trek: Next Generation)
Tanya Roberts

Acresses born in 1954 would have been 12 at the time.

Catherine O'Hara (Beetlejuice / Home Alone)
Kathy Segal (Married With Children)
Rene Russo
Kathleen Turner
Ellen Barkin

Actresses born in 1952 would have been 14, already in puberty and technically a casualty. My only nomination is Angela Cartwright who was in “Lost In Space” at the time. She's just a personal favorite.

Any thoughts on this? What would the dynamic be between Shatner and Maureen McCormick or the others be like?