Making your house less desirable as your neighbors is a big factor.
You have a good start, make sure that shurbs etc., around the first floor are low a prevent hiding.
Signage is effective and cheap - criminals hate dogs. Buy a beware of dog sign even without one and a bullet decorated target near the entry doors cuts down on solicitors too
Cheap simple door wedges (with alarms for under $20/pair at Sportsmansguide.com) are cheap and very effect delays and can be brought along when traveling.
A good can of wasp/hornet spray has good range and is very effective.
Now getting your wife to shoot and carry is a whole seperate and unique challenge that often requires a direct threat to motivate most. People that call it paranoid to be prepared for violence probably wear seat belts and have a first aid kit and fire extinguisher -same logic, but harder to sell. Start all new shooters with a 22lr and they won't be so adverse.
Long guns as a primary is generally not logical in a typical household because it is rarely in arms reach and is difficult to manuver for most, and recoil is often an issue with a SG.