I would say it's risky at best. You say he doesn't want his sexuality made into a big deal, so I doubt he'd be a huge fan of everything and everyone decked out in rainbows. Based on what you said, I think a normal birthday party would go over better.
As long as you are as openly supportive of his being gay as he is open about being gay, he will feel loved and supported. He doesn't need a color scheme or party theme to explicitly reinforce that. I'm glad your family is so supportive of him.
Many who come out aren't so lucky. Happy birthday and wedding to him!
Don't have a pink shirt wedding with pretend gayness that's offensive. Ask what he wants that's the proper thing to do.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.