This may help. I have five thumbs on each hand, when I type.
Open the "Ease of Access" centre.
Click the option " Make the keyboard easier to us"
Click "Turn on toggle keys."
Click "Apply" at the bottom of the window.
This gives you a warning bleep when you accidentally press those keys. I did not find it a great help at first, but when I "Tuned in" to listening for the very distinctive beep, it was my answer.