The time of cheap turbine ratings is over. If you want an initial turbine type rating, you must do it through an ATO such as 43 or Simulflight etc, if you are not holder of an ATPL - you must also get a HPA certificate, you need at least 6 hours flying time, of which 3 can be in a simulator and this does not include a 1.5 hrs checkride with a testing officer (DE).
So that is already 4.5 minimum: you will pay +/- R63000 just for the aircraft and this does not include the 3 hrs simulator or the groundschool. If CAA decides to make the 1900 a Multicrew - they might also require 25hrs MCC training.
So in the end it will cost you about R100000, if you do it properly these days. The CAA is monitoring this very closly at this time, which is good as it ensures the candidates can do the job on a sound foundation. Downside is: it just becomes a lot more expensive.
Read Part 61 what the requirments are, for your own good. What I write here comes from personal experience.
I would only invest in the rating, if you have more hours to back yourself up with and a job in the pipeline. With your kind of hours - just to risky, save up some cash and do it when you need it. Chances are good, the a company will bond you and you can keep your money in the bank.