Personally (as an MIT graduate) I don’t think that you should worry about it. Participate in the ECs that you want to participate in, and do them very well. Then apply and see what happens.
As others have said, the acceptance rate at MIT is low enough that you cannot count on it, and cannot even think that it is likely. It does not make much sense to distort your life to try to guess at what MIT admissions wants when you know that you will probably be somewhere else for undergrad.
My ECs had nothing at all to do with anything STEM. The only one that was even remotely academic in any sense was chess club. However, the (non-academic, non-math) ECs that I did, I did well. As far as I know this appears to be what MIT cares about.
Also, be aware that studying at MIT involves (i) Suddenly becoming only an average student the day that you arrive on campus; and (ii) A lot of hard work for four years. Make sure that this is what you want.
And make sure that you are happy with your safeties.