I also have the bamboo beige interior and I feel like it looks bad with black alcantara race seat swaps or even the standard pole positions. From all my rabbit holes on this, I think the GTS execution (half cage + pole position seats) is about the best you can get for a club sport type build.
Then I found that some people can get them recovered in bamboo beige to match. It's probably more hoops than just a regular seat swap. It's also teetering on show car levels of detail, but it's worth a look.
https://www.m3post.com/forums/showthread.php?t=1243068
I believe this is a shop that does the work:
https://amx-performance.com/ I'd expect most upholsterers to be able to do this type of work though.
If you dislike the beige entirely, you could pick up someone's e90 interior part out and swap over the ones you like to remove all the bamboo colored ones.