There are tons of ways to safely store a firearm that mitigate the "where is it" objection, all of them cheaper and safer than buying a new gun of debatable reliability.
I have yet to test this but I believe the grip safety of a 1911 or the standard safety lever on a modern pistol would thwart a toddler as well. Teenager not so much.
Again, this is a solution in search of a problem.