the PRO records show all regts (usually in sequence) to which he belonged - the Veterans were I think those considered too old or infirm for active service - the 11th RV was sent to the Island c. 1811 stationed in Peel + castletown (+ I think a small unit at Douglas and possibly Ramsey) - one job was to re-fortify Peel Castle (in the process of which they + subsequent troops wrecked much archaeology for what was an unnecessary construction.)
Several of the 11RV married on Island before the regiment was disbanded c.1814 (it may well be that some native Manx wrangled a transfer to it) - I have a little on manxnotebook