They did try to re-engine the Bou in the early 90's. Not the RAAF, I believe it was Dehav's.
Here is the result of the final test flight.
http://www.youtube.com/watch?v=r5S_pP4_MII
Whilst the accident was not the fault of the modifications, the loss of the prototype in such a way probably took all the steam out of the project.
Don't try to take of with control locks engaged...