Even if we're probably in the minority, a not insignificant number of AE speakers (including me) do indeed pronounce a Y sound before long U in words like news, stupid, due, at least some of the time, especially in more serious or formal contexts. Particularly anyone who has studied vocal music, drama, public speaking, etc. should have picked that up, since it's considered part of our Bühnenaussprache, to the extent that we have one.
So in many words that pronunciation isn't exclusively BE. (Though in a few other cases, like after S, it may formerly have appeared only in BE: super, suicide, sue, issue.)
>>(And we probably don't say "cumin" correctly either.)
Is one way more correct than another? I say 'kummin', but I've also heard 'k(y)oomin,' if less frequently. And I usually say 'bassil,' but my mom says 'baysil.' I have no idea which of either of those is more traditional or more like BE.