Hello, James.
Possible work around:
One thing I have done is copying and pasting the html off the pages by going to the <> button in the editing text box and highlighting it all, copying and then opening the new wiki edit text box for each specific page beginning with the first page and clicking the <> and pasting in the code for that page and saving. It's a little more labor intensive than just importing, but if you only need to do it once it's not too bad.