As a non-native English speaker I pronounce "bomb", "climb", "thumb" etc... with a clear B at the end. I know I shouldn't, but it's automatic.
So, I was interested in asking if native English speakers would understand such wrong pronunciation, or how weird it would sound... however, since listening comprehension is an individual phenomenon, such a question seems inherently opinion-based and therefore off topic. Is it possible to formulate a question regarding the comprehension of a wrong pronunciation without it being opinion-based?