tbh you can get a better deal. Yes, it won't impact the GFV at the end of the 3 years, but you will pay a lot less per month and overall.
I mentioned it on here before, but I was getting quotes for £3k off too. Then went on to coast2coastcars entered my spec (different to yours) and a Hyundai dealer called me the next day with a better deal. Ordered it pretty much straight away. Just need to be prepared to travel and also wait for a factory build.
The quote for your spec, DCT with N seats and PB is coming through at £31,394. Comparing that to the original list price, it's a saving of over £5k. With that sort of saving + interest, the GFV shouldn't matter as much as you can pay it and sell it for what it's really worth after 3 years or even just plan to keep it. Or as someone mentioned, use the equity left in the car for a deposit on the next one.