Yes, i believe I do have some more info on the MacBeath side. On scotlandspeople, there are now death/ burial records. I believe that one for William Macbeath ( can't remember offhand the exact spelling as it changes a lot around these years) who died around January 1851 may be our william. However the image is not yet available. You'll also see there are quite a lot of McBeaths in the death/burial index of Blackford ( I have an excel file of the index if you wish). Some of whom I know are in the more extended family.
I also have a transcript of Blackford Graveyard headstones ( central section and Kirkyard were mentioned) and i don't know if there was only 1 graveyard in blackford. The transcript used to be available on-line, WMcB does not appear to have a headstone there,(Or indeed his wife). However this i think was common for early graves.
Hope you enjoy blackford when you go, I haven't been yet.
Cheers
Fiona