It may look complicated initially but it is in fact not. Its the value of the unbundling that makes them nervous. Any instalment/ enhanced divi product states that all and any payouts flows through to the holder cause the issuer holds the underlying. So it should not be a problem merely distributing the PPC-shares, same as any special dividend. May have a slight problem with subsequent pricing of the instalment, but BAW should run up enough for that calc to do. It may just look strange for instance on BAWSTA that you'll pay R1 for it with a final payment of R107, if BAW is trading ex-div at around R108, but that is how the price is calculated at the moment (barring small adjustment for interest.
Simon, a suggestion, SBK can keep the PPC shares and change terms of the instalments to cover both shares in a combo and at expiry can decide if you want to realise. If not new issue can be 2 seperate issues over the 2 shares and voila! Then the combined price should still be around R200 and you just keep track of the combined movement at the appropriate ratio.