No, they won't pass new MOT regs as you are not allowed to remove any OEM airbag at all, UNLESS the car is substantially modified for a different purpose eg a rally car, or track car. Your friendly MOT guy might consider a set of wheels and a new stereo as modified, or he may consider anything less than a fully stripped & caged car to be not modified enough. Always interpretation, but you'd be unlikely to win any appeal if the tester knocks you back.
In terms of danger, some would argue no airbag is actually safer as you're not putting an explosive device aimed at your face I personally don't subscribe to either extreme of "REMOVING IT WILL KILL YOU!" nor "OF COURSE IT'S SAFER, MY MATE BROKE HIS NOSE WHEN HIS WENT OFF AT 5MPH!", but removing airbags in general has never worried me. I know the risks, I'm an adult, I'll make my own decisions regarding my own safety ta.