No easy answer other than buy a good (bigger) 2-stage and YOU use it to clear the sidewalks. The 2-stage models have all of the things you or your wife would like even heated grips or handles and headlight for night clearing. Almost all of them have 120v electric start and I think there are some that even have (lithium) 12v battery starters too? To get what you need or want the unit is going to get a litter bigger and a little more work to use but then again being self propelled, remote adjust chute (left/right/up/down) electric start, heated grips, night and safety lighting, etc., may outweigh all of that when it's below 0 and there's a foot of snow covering your walkways in the dark and you would like to clear them to get somewhere the next morning.

Mike