You can train for success or you can train for failure. The "tour" you suggested was the later. Sure it's possible in the same way someone can go from not running to becoming a marathoner in few months, but it's not the smart move. Talking about stuff online is easy. Riding big days without having ever done them before is hard and not particularly enjoyable. People post on this forum all the time about wild ideas that are technically feasible while being pretty unrealistic. Generally you never hear from them again because they either realized their folly or started the trip and blew up after a day or three.

The folks on this forum gave you reasonable advice based on what you posted. If you don't want other peoples' opinions than a bike forum is not the place to post your thoughts. Don't ask for advice and then be unhappy when it doesn't mesh with your ideas - after all that's why we ask other people for input because they can clue you into things you aren't considering.

To put it bluntly the fact your lady doesn't want to ride long distances isn't anyone's fault on this forum - it's yours. Going huge for a first tour/ride is the classic way to get your partner to never want to tour again - that's not a male or female thing - that's equal opportunity stuff!

On the plus side there is no reason that given a bit of time and some better route options you won't end up riding longer distances together. Lot's of people will never enjoy rando/brevet distances regardless of training and even most randos won't enjoy them if the route is "hostile". But, if you start with shorter road rides, building to distances of 100K then maybe try some touring to link back to back 100K days you'll both have a lot more fun and after a few back to back 100K days you'll both know whether 200K-300K a day rides is a reality for you.