It is totally possible. With my Intel NUC 9 Extreme, I can remove the top part; the fans are fixed with screws. I disassembled them to apply 3-in-1 oil, hoping to eliminate the noise, but that did not work.

I found these fans on Amazon that would fit: https://www.amazon.com/gp/product/B00BD7PF0E/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1 Although they claim RPM range is 2000 - 6000 people in the comments mention that they only reach 3000. I don't know if the current ones go up to 6000. That's why I have not pulled the trigger yet.