Luckily I won't need the EAD this time, I took early retirement (I may work again in the future but it's no rush). What we are thinking right now is that we will stay on the I-485 route, cancel our return to Canada for now and apply for the Advance Parole so that we can make trips home to Canada at some point while the I-485 is pending, since it's a 17 month wait supposedly in Vegas.
If anyone sees flaws in that plan please let me know, we are all ears, and very much appreciate all the advice and tips we are getting here.
It sucks that applying for advance parole is over $600 now. It was free when I had to request it for work reasons while on the K-3 10 years ago.