Do you mind sharing what you ended up doing about staining and sealing your door? I've just bought a Simpson wood door for our front entry (Douglas Fir) just like you described. The information on Simpson's website is confusing and I'm getting conflicting advice from the paint store and stain store. I, too, want to stain the door. Thanks

I'd seriously consider mdf doors and have them painted for the island. Maple is so difficult due to its eternal tilt toward yellow . and darker stain attempts just dont go well. I could see a painted green island . Are you working with someone who can show you samples of stain on maple for your situation? Thats where you have to go initially and take a pic of final 3 you might like and post them here. Your other choices only look cool to me so maybe a grayed medium shade but again darker pigments of any sort are just really difficult. A different species like QS oak would handle natural stain without a yellowish cast so you can stay light with that sort of pick.

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjr0ov6rYz9AhWXnWoFHbEGDEcQFnoECBYQAQ&url=https%3A%2F%2Fwww.kylieminteriors.ca%2Fhow-to-mix-match-and-coordinate-wood-stains-undertones%2F&usg=AOvVaw3XquD8C5USLgR75Ac1PMJx Very informative advice for coordinating wood tones.

Do the stain for the beams the same tone as the darker in the flooring. Good info here: https://www.chrislovesjulia.com/6-different-stains-look-5-popular-types-wood/