What about a Danish teak platform bed? They were made in king size and are not too hard to find if you're willing to deal with having one shipped to you. Most have attached nightstands. There are variations in the headboards--horizontal grain, vertical grain, narrow framing, no frame, etc. Some have a couple of hidden storage drawers under the bed. I have one of these and I like it very much.
Lots of photos on Pinterest though most are shown not made up:
https://www.pinterest.com/search/pins/?q=teak%20platform%20bed%20denmark...
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