No. It is not acceptable because how do you rule out any emotionally coercive factor? This is an exploitive transaction that requires a woman to put herself at risk to produce a child on demand for someone. How is true consent judged when there is potentially either a financial power or an emotional power at play to influence that consent?
It is actually quite similar to the kidney example that you have dismissed.
In any case, this judge understands.
"Their ability to recall what happened, and in what order, has been impaired by the anxiety felt for the health of the babies, and by the tensions that arise when a woman's body is rented for the benefit of others and where the unit of exchange is measured in the life of a new human being," Judge Thackray said.
This judge says it like it is in this particular sentence.
https://www.bbc.co.uk/news/world-australia-36012320
He also said:
Justice Thackray said the case "should also draw attention to the fact that surrogate mothers are not baby-growing machines, or 'gestational carriers'".
"They are flesh and blood women who can develop bonds with their unborn children.
and
"Quite apart from the separation of the twins, this case serves to highlight the dilemmas that arise when the reproductive capacities of women are turned into saleable commodities, with all the usual fallout when contracts go wrong."
https://www.abc.net.au/news/2016-04-14/baby-gammy-twin-must-remain-with-family-wa-court-rules/7326196