The 1901 census in Ireland has only 1 Dudley Hussey - and he was 29 and born England, so unlikely to be the Royal Irish chap
The 1911 Irish census only has 2 Dudley Hussey and they are too young
And
The only 2 Dudley Hussey in Griffiths circa 1850 are in Dublin, but about 25% of the 1000 Husseys in Ireland then were in Wexford
And
There are only 5 birth records on Irish State registers for a Dudley Hussey, and none of those could have been your man here. Free BMD only shows 1 Dudley Hussey born in England, and he could not be your man either!