Just a suggestion, I have an E-Visa, what have done the past few years is to print it out, fold it up and paper clip it to the second page of my passport.
Doing so makes it quick work to show an airline, and to hand it to immigration. I leave it in my passport until I return to my homeland just in case any questions arise
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