My main concern would be where you feel like you won't make it to 65. If you both sit down and honestly feel that way, then I don't see why that is even a part of your equation.
There are a number of questions you need to ask yourself. You say that, if you do what you want to do now, you'll use up the nest egg by 62 and will have live off $4200/month. But, if you take the next 6 years and do all the things you want to do, what would you do after the age of 62 that $50000+/year wouldn't be sufficient?
Yes, I'll agree... $8000/month if you stick with everything that way it is today for the next 9 years is an incredible number that would have you in an extremely comfortable situation for the rest of your life after that point, but if you've already resigned yourself to the fact that you won't make it there, it's not going to do you a lick of good.
But, seriously... don't take much advice from a bunch of us here on the internet. Have a good, honest talk with DW and then have a sit down with your banker and talk about it.