it is not easier neither more complicated. It will be simply considered as a good experience and you probably will be asked the reasons behind your decisions.
I have had some colleagues with previous experience in Big4 - financial advisory (you can find MBB consultant profiles on LinkedIn, filling the past experience in the advanced research).
Easy is subjective. If you look at the odds, getting into MBB even from a highly competitive background would not be considered easy for most people.
What might be slightly 'easier' for you given your background is to apply for sectory specific roles where available. For example McKinsey has a risk practice that you can apply to as an Associate given your background
All the best,
Easy or difficalt it depends actually on you, and especially on how much efforts you want to pay to get an offer. But I would tell you that practice and experienced guidance make evrything possible.
How do you measure easiness? Its the same as for any other job / background - the application and the interview process are the same