I was going to post and say that I don't think it would be easy to convert a Fairey kit as I thought that there are too many areas that would need alteration and Will's post has confirmed this.
As well as the changes to the stern the bow needs changing as well. In side view the Huntsman 31 would appear to have a similar raked bow but it has a significant flare which the Corsair doesn't and the Huntsman's is very round in plan view . Other Faireys have blunter bows i.e. the Huntress and Huntsman 28 and so aren't suitable. Then there is the superstructure of course though that is the easiest to alter, though the deck camber in greater than the Faireys.
In my view to build a credible model it really needs to be scratch built and Will's drawings would greatly assist with that.