None of my cars have keyless entry, and I prefer it that way. Two things are
always on my person: my keys and my wallet. But we're all only human and we're all liable to make mistakes.
So here's a simple solution for you: have a duplicate key made from the generic ILCO blank #X174 TR40. It lies flat because doesn't have the big, black plastic head on it. Put it in your wallet. Potential problem solved.
Of course if you forget your wallet,
you might have an even bigger problem if you are stopped by the cops...