There’s a grainy, two tone image in a local guide to Columbkille that shows what really looks like a cup with a single ring and duct. The text implies it’s a cross, but it really doesn’t look like one. The slab is part of the roof of the souterrain which runs below the churchyard.
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Hob , have you been visiting the area , and if so did you have a look at Malin More ? Lots of e.g.s of RA in souterrains and often on lintels .
G
I've not been G, picked the book up in the hope of getting over there at some point as Mrs H has vague ancestral connections that way.