Rotorhorn,
No. To endorse your JAR-PPL(H) you would need to do the Jetranger course at a JAR approved school, either in the UK or in another member state.
However, should you come back with it endorsed on a SA PPL(H) then you would be able to fly G-reg 206's on your SA Licence!
Strange, nonsensical but true.
Wibbly