I'm sure you will be inundated with the typical hellos in short order.... as I've been married for 30 years, I can avoid all of that.
Nice to have you along for the ride.
I am not personally a fan of lowering bikes. I know there are a lot of reasons that make sense for some people, and respect that choice.
If you have to lower it, and go through with shaving the seat in addition to that to make it even easier to get a foot down..... there really isn't going to be that much more you can do. From there, platform footwear is about all you can do IMHO.
I have always wondered why it is so important to get both feet flat on the ground. Anything more than the ball of one foot touching when you mean it to is pretty much excess, as the foot is typically there for the third point of support to keep the bike from tipping over.
Trying to go backwards on your tippy toes doesn't use very many of your leg muscles, and none of your arms. Poor traction and almost no muscle power means the situation is a lot more precarious than it should be. If you need to back the bike up, it is far more effective to get off and push the right direction so you can get decent traction and involve your whole body in the effort.
When I was a pre teen, and stole rides on my older brother's bicycles, and then their dirt bikes I could never get both feet on the ground. When they had 10 speeds, I would have to launch off of a curb, if I wanted to be on the seat when I got going.
Trying to jump start a motocross bike when the seat is almost level with your armpit takes some gumption (and desire)...... but it can be done.
Once the bike is in motion, it doesn't matter if your foot can touch the ground, at all.
If you look at the MotoGP racers, almost all of them are the size of jockeys -- for the same reasons. Smaller is lighter, and lighter lets you accelerate better (winning).