Mike!
Welcome to the Forum and to Thorn ownership.
I really feel for your present state, and we've all been there at one time or another, wishing and hoping against hope we'd made the "right" choice on a major bicycle purchase. Having the safety net of a return will help greatly, but I can still empathize with the sleepless night. I had a few of those myself after signing the purchase order for mine!
The good news is, I think you'll find the bike "rides lighter" than you might expect. Sure, it will be different from what you're used to, but sometimes that's the point, and "different" doesn't necessarily mean "bad". I would suggest trying the bike insofar as possible keeping its own merits in mind, and weighing them against the standard of what you're used to. Yes, the bike might be/feel heavier, but will have less maintenance (a huge boon during the wintry months, especially) and lower operating costs not just now, but for years to come. You don't even need to take a world tour to remote places to enjoy the benefits! The color's a real beauty, and "Sport" is this bike's middle name (literally!).
Like Andy, I think you'll not regret your decision. Even if you do, a good full week's riding will give you firsthand experience and insight into what meets your needs and what does not, and you really can't put a price on that sort of education. It will do you in good stead, regardless of the outcome now. If my experience with my Sherpa Mk2 and now Nomad Mk2 -- and that of so many other owners on the Forum -- is any indication, you'll be in for a pleasant surprise. Fingers crossed it will meet expectations.
Looking forward to hearing how it goes; even little reports on the installment plan will be welcome!
All best wishes and luck your way!
Dan. (...who is optimistic for your happiness with the bike and helping you countdown the hours till arrival and first ride)