I am a believer in Boot Gloves as well, and I don't need toe warmers. I also switched to merino wool socks this year and the sweating issue has disappeared. My recipe for warm toes:
1. Dry your boots every night with the hot sticks or an air boot dryer.
2. Try to keep your boots warm on the way to the hill. I leave the sticks in and shove my mittens in the tops if it's going to be longer than 15 minutes to the hill because I have to run an errand or something.
3. If you have like a two hour drive to the ski area, then buy one of those warming bags that plugs into your cigarette lighter in your car. OR, if you can't do that at the very least go in the ladies room and use the hand dryer to get the boots warm before you put your foot in them.
4. Put your boots on in a warm area, not outside in the parking lot.
5. Use wool, not synthetics, for your sox. I liked Thorlos for years, but at the end of the day my feet were damp. I love some Lorpen ski socks I got from Backcountry.com.
6. Use BootGloves. Get your bottom two buckles set to wherever they need to be for the day as best as you can. Cinch the BootGloves tight to keep out snow. Fold under the toe area a bit to keep it away from the ski binding or take the time to cut it up a bit. (I just fold it under.)
7. KEEP YOUR CORE AND HEAD WARM!!! If your core isn't warm it takes blood from your extremities to do the job. Before I had BootGloves, I also owned a less warm ski outfit and on those days in the negative 20's I'd toss on this Eddie Bauer down jacket that I call my "Nanook of the North" jacket:
https://siberianrescue.com/other/DiggingOut/image015.htm. I was so warm in this jacket (over all my other ski wear, including my ski jacket) that my feet were even warm without any assistance! It's NOT a ski jacket, but when the chips are down and it's stay home or ski, then I USED to pull out this jacket. Now I have an Arc'teryx that almost as warm, and I have the BootGloves, so I don't need the Nanook.
I've found on those warm days when I don't use BootGloves that when I come in to lunch, there's snow caked on my boots. That doesn't happen with the BootGloves. So, just having them as snow shields must help, because on "warm" (over 25 degrees F) my feet end up colder. I guess I need to redefine "warm" and use the BootGloves all the time, but the degree of cold is bearable and I have access to my buckles. I can still access the buckles with the BootGloves on, but I have to undo the strap around the back of my boot to do this, which is kind of a pain. I looked at making slits for my buckles, but decided it would compromise the structural integrity of the BootGlove too much.
I also just saw some neoprene covers just yesterday on someone that did not involve a back strap on the cover, just a toe cover. Of course, it was a warm day, so I don't know how well that competing product would work on a colder day.