I have tried the shoe covers, but on the Bacchetta the wind just blows into the cutout for the clip and freezes my feet. Here are the best shoe covers I have used, but when I switched to the ultegra pedals, the rubber sole rubs the crank arm. I would have to install pedal extenders to use them on the Bacchetta.
http://www.performancebike.com/bikes/Product_10052_10551_1018749_-1___ I considered the wind blowing in the bottom of my shoe through the shoe cover cutout, so I took a foil sunshade for a car windshield, and cut out a shoe insert hoping the foil would reflect the heat back to my feet and block air coming in the bottom of the shoe. It helps, but still does not keep my feet warm.
Tried the chemical handwarmer, this was nice but in cold temperatures, would not last but about 30 to 40 minutes. Not much good on a two hour ride. However, I never tried them on top of my toes.
Last year I would just wear a pair of wool hunting socks in my normal riding shoes. No room for another pair. This works pretty good but feet still get cold when it is in the 40s and below. I also slipped a sock over the shoe with a cutout for the clip, but almost fell when I put my foot down. My heal could not grap the asphault. I did not think about cutting out for the heal.
I have a very nice trainer, but I hate using it. It is SSOOOOO boring, that I prefer any weather except rain to working out on it. I even bought a niteflux photon max extreme headlight so I could ride in the dark instead of using the trainer.
So with all that in mind, I started considering an insulated shoe. That is why I was considering the Lake shoes. The problem is they are twice as expensive as my normal shoes and I was afraid they might be too warm for North Texas. I don't want to waste $250. Rather spend it on cool components. LOL
It looks like you guys didn't waste your money on winter shoes and the alternate methods are working for you. As you can see I have tried most of them, except the toe covers. I have not tried that. I assumed if the shoe cover did not work the toe cover would definitely not work. I also may try the sock over the shoe again and cutout for the heel stop.