The opener scored 82 off 41 balls in a four-wicket win at Southampton.
David Willey and Sam Billings rescued England after a middle-order collapse.
Rashid became the first England spinner to record 150 ODI wickets while Campher top-scored with 68 for Ireland.
Injury to his team-mate has given another Kent player a chance to impress.
The Johannesburg-born player stood out in the six-wicket loss to England in the ODI series opener at Southampton.
The fast bowler was not at his best when he made his return from an ankle operation against England Lions.