Aside from the Peel commission's plan and the partition plan of 1947, I don't know of any other proposals Britain gave, especially not one within a "a greater Palestinian" state.
Here's the map for the Peel's commission plan:
This is true, Zionism was always against the idea of a Palestinian state, and have lobbied against it decades before the Nakba in 1948.
Here is one of the leading zionist leaders in the early 20th century, echoing these thoughts in 1931: