Chris Cooke has been in England for 10 years and he has a UK passport and as well his age he's primarily a wicket keeper batsman and we're not short of them.It'd be impossible for the second placed guy because he's Hashim Amla, so he's 1) retired from international cricket and 2) tied to RSA. As for the other two (David Bedingham and Chris Cooke respectively), I'm not sure either has citizenship yet. Cooke's 35 so his chances may be cooked (Cooke-d?) by that, but Bedingham might be worth keeping an eye on in the future
Bedingham has been playing in South Africa for Western Province this winter, so I don't know if he has ambitions to play for South Africa.
Graeme van Buuren has recently got a citizenship so he might get a game. Our best ever/recent test team had Trott and Pietersen so maybe we need some fresh imports.