You simply don't want to know. With the CAA / EASA - it's on a per-hour basis, and the rate is the other side of £150 per hour per engineer. And it will take a lot of engineers.
Talk to Canada's National Research Council about doing the flying for you - they have a fly-by-wire 412 that they could literally drop your software into. Rates are reasonable too - and they really know what they're talking about with regard to handling qualities and flight safety. (I'll collect my commission later, guys).
Unless you have a whole lot of experience doing certification, I wouldn't even dream of trying to do this until you've gone through the NRC 412 route.
PM me if you need contact details.