Wouldn't it be more traditional to wait until you get to Bali for the layover?

Late at night / early in the mroning you could expect around 30 mins in a taxi from BKK airport to more or less any of the top of the range hotels.

If I were you as an SPG Plat I would go for the Sheraton Grande Sukhumvit and fax them in advance to advise that you are en route to your honeymoon in Bali. I'm pretty sure that unless they were completely packed out you would get a great suite and quite possibly a bottle of champagne or something on the house.