Personally I wouldn’t use glaciers or the like. I understand the desire to not over penetrate but if there is an armed attacker actively shooting I would be just as concerned with under penetration. Look at Miami. Even the FFDOs anc Federal Air Marshals carry or carried 155 or 165 gr Gold Dots in their 40 S&Ws for years. Not sure what they are carrying with the flight back to the 9mm.

For minimal penetration in a 9mm something like the old +P+ federal 115gr Stops pretty quickly once it starts expanding. My favorite 9mm ammo is the 124gr +P Gold Dot and the +P 124gr HST.

I've listed the link here many times. you cannot miss. A stray round, no matter WHAT the bullet design is more likely than a magic bullet. But they make a 77 all copper HP in 9mm

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Of the Troops & For the Troops

Try Federal HST or Hydra-Shok, for both 9mm and .45.
You should do fine with either if the need ever arises.