If you apply for a evisa, they are going to ask for your itinerary, and you must have proof of that, such as a copy of your flight tickets. You are going to open up a can of worms for yourself if you apply and provide false information.
I just arrived in Thailand with the same 90 day nonO married to a Thai e.visa. Just print out the page that has the QR code on it. What I do is paper clip it to the page that immigration will stamp, that way immigration will see it before they stamp you in, but it’s always a good idea to double check that stamp for the full duration of your evisa