Sorry, hanes teulu, I should have typed Loch EIL, not Loch SHIEL in post #2 above. Interesting about Camasnacroise, I’ve not heard of it before although the Chapel of Ease looks to be a modern facility.
Rosinish, yes, it looks like the Ft William minister travelled across the loch to Camusnagaul, but I’m trying to establish whether there was a purpose built church there, did they get married at the Inn, or was it another tent

From the two certs:
Ann Boyd & Duncan Cameron:
On the seventh day of February 1856 at Camusnagaul, marriage was solemnised between us according to the Forms of the Free Church of Scotland …………. signed Chas Stewart, Free Church Minister of Fort William
John Boyd and Isabella McGregor
On the twenty first of February 1868 at Camusnagaul, after Banns according to the Forms of the Free Church of Scotland ………… signed Chas Stewart, FC Minister of Fort William
Interesting about the church at Blaich, Carolbea. I hadn’t heard of this, so well worth investigating. But too far from Camusnagaul to be the right one for these two marriages.