I’ve obtained a LaTeX .cls file that Math and Computer science PhD students used for their thesis. I’ve modified it a bit (style of page numbers in preamble) and wrote a very simple .layout LyX file associated with it. It seems to work fine for me, but you’ll likely have to use a bit of Evil Red Text (ERT).

You can download all files (including a README installation file) from this .zip folder. More information are here on my website.