If your only reason for going to RMAS is Para Regt, you need a long hard think about what your plan B is if you don’t get one of the few places offered each year.
I've some friends who - despite being mad keen on the Paras and rightly rating their chances - didn't get selected. They never got over it and either left at the first opportunity or carried a chip on their shoulder for their subsequent service.
This pretty much did not happen with any other capbadge at Sandhurst.
If you genuinely wouldn't be happy elsewhere, that's fine - better to be honest with yourself and the system.
In which case, put in for the Royal Marines. Similarly plum roles & high deployablity, equally arduous, with the advantage that if you don't make the grade at Lympstone for whatever reason you can move on, and either get back to your current job or look at the reserves.