Andy J2022 - I find your reply rather confusing. Are you saying that no men of the Royal Sappers and Miners were involved in the Irish Survey from 1810 to 1835?
My relative, John Fowler was definitely in the Royal Sappers and Minersand he definitely worked on the Irish survey, not as a surveyor but as a draughtsman.
He was born 22 Dec 1799 he was a corporal in the Royal Sappers and Miners when he was discharged in 1839. He joined Royal Sappers and Miners as a bugler on 6 July 1811 and served as such until 5 July 1818. Then he was a private from 6 July 1818 until 31 Dec 1824, 2nd Corporal from 1 Jan 1824 until 31 July 1832, promoted to Corporal on 1 Aug 1832 until 8 October 1839. All this with the Royal S & M.
There is a document in his service record (1839) , which refers to a medical board where John's fitness for further service was examined. It states "he had been employed as the last fourteen years on the Irish Survey as a draughtsman, during the last seven of this period he has found his vision becoming impaired, so that he cannot see near objects with any degree of distinctiveness..."
Possibly the OP's relative may have served in a similar capacity as mine.