I don't think handgun skills degrade so rapidly but in any case, I'd say all of the round counts are way too high, even if you're shooting just .22s. These numbers represent over a hundred dollars a week for one thing and for another, I even think your skills peak rather quickly. In short, I'd say the two choices are both impractical but my suggestion of shooting no more than your normal carry load is probably equally impractical.
Shoot low, sheriff. They're riding Shetlands!
Underneath the starry flag, civilize 'em with a Krag,
and return us to our own beloved homes!
Buy War Bonds.