I've photographed most of the stones in Alva Cemetery bearing the names of men/women killed in either WW1 or WW2. If any of the folk you're looking for were unfortunate enough to have lost someone in either war, get in touch and I'll have a look through my lists.
I may be able to assist with the Alloa MI's - maybe even the Alva ones. An update of Mitchell's inscriptions was done in 2002 & I bought the book. I'm not sure whether all cemeteries were updated or only that Greenside (Alloa) was added.
The Central Scotland Family History Society has produced a publication on Alloa & Hillfoots Burials Pre-1855 which includes 1,931 transcriptions of burial records for Alva, mostly from the period 1730-1800.