If you do get an odd text type, just turn all the main arguments/thesis from your essay into whatever is asked.
For example, for an interview, if you had to do an interview with say, the author of your novel or something, just ask questions where you can produce answers which are basically all the points in your essay.
Eg. 'So what do you feel are the most important things about belonging?' 'What are some texts which you feel portray concepts of belonging and why? How do you think the author has effectively portrayed the ideas?'
Same goes for conversation (this was an hsc question one year, for Module B i think)- obviously a 'regular' conversation would be quite casual, but in doing a hsc-suitable response, you would put a 'casual' spin on your essay, but you can't dumb it down to the extent where there's really no complex ideas.
Basically, mould your essay to the text type, but ensure you have: Clear thesis, 2-3 main issues/concepts, and still cover techniques, quotes and context etc.