Reiver,
I have the Clackmannan Parish Burials Index. The period covered is 1832-1854 so no William Penman in it, I'm afraid, but there's an Elizabeth. I'll list all the Penmans mentioned:-
PENMAN(no first name) , child of David, buried 18 Dec.1832
PENMAN, Elizabeth (other name Bernard), wife of William Penman,labourer, buried 26th July 1848
PENMAN, James, child of Hugh,labourer, buried 7th Feb. 1854
PENMAN, Margaret, child of Hugh,labourer, buried 25th Oct.1853
PENMAN, Michael, engine keeper, buried 18th May 1853
Elisabeth