Many thanks for this! I had found a few of these possibles but not Alexander. I also did not have your level of detail - ie. churches etc, so this was great!
I do have a possible death for Daniel Stodhart McCrae (born 1845), in 1852, Geelong, but it doesn't list his middle name, nor does it list his parents, so I haven't regarded it as too much yet; still it is at the right time and could explain why no marriage is found.
If you or anyone else is looking for more information about Colin and Catherine McCrae's daughter Catherine (who married William Royse), I'd be happy to provide what I have on her and her family in New Zealand.