As above - that a nuts amount of work and you are risking all of your grades by doing 4 A levels without adding in 'other stuff' as well.
An EPQ is possibly worth doing as its a 1-year commitment that will give you an obvious topic to discuss in your UCAS PS. The others sound a total waste of time and effort. Remember AAA is always going to look better than 'ABBB plus a weird GCSE' that you never needed to take in the first place.