I suspect the only consequence would be to reduce the number of CEng registrations even further - it's hard enough getting applicants to get around to finishing their applications as it is, without making them have to do it twice!
That said, this is exactly what I did 20 something years ago (IEng and then CEng), but in hindsight the IEng probably didn't contribute to getting CEng, and actually if I'd been properly advised I should have been able to go to CEng straight away anyway.
I suspect the only consequence would be to reduce the number of CEng registrations even further - it's hard enough getting applicants to get around to finishing their applications as it is, without making them have to do it twice!
That said, this is exactly what I did 20 something years ago (IEng and then CEng), but in hindsight the IEng probably didn't contribute to getting CEng, and actually if I'd been properly advised I should have been able to go to CEng straight away anyway.