I have considered all of your points. You are correct I may struggle, to find someone who ticks all of my boxes. Like you I plan to be very selective, but I want the possibility of something better. If my life was fantastic in every way and lack of sex was my only issue. I would do like many on here keep the wife and find the sex elsewhere. I think that I should have put a little more in my original post. Even though I am getting sex elsewhere I am still unhappy at home. Simply put I can not imagine staying with my wife for the next 40 years.
I am not anti-relationships, I would ultimately like a long term civvie relationship. I am not hoping for years of being single and shagging my way around the world. I would continue my current sugar relationship while looking. I would prefer not to have to worry about being caught. If the right lady came along, I would end it with my SB. I would be more concerned about getting into a civvie relationship where she saw me as a meal ticket. I would also be worried about a relationship with someone much younger than me, in case she got bored of me and dumped me a when I am 65 or 70.
I do of course have the ultimate back up plan. The decision made by any over 50 single man, Thailand or Philippines.
You seem lonely, unhappy and confused, searching for perfection which does not exist without compromise, while living with your wife and in a sugar thing in your spare time, give yourself a break man.
@Miss Wolf has pointed out in the post above the flaws in your plans, you need to be in a happy place before anyone else can make you happy

, and that means finding yourself, alone and in your own time.
Taken me 10 years since the end of my marraige, had 3 fairly short relationships, 18 months max, that I knew would end up nowhere but enjoyed the company at the time, only just learned about 6 months ago I want more, to have a serious relationship and got lucky, there is always luck involved.
You seem to not only seeking perfection, but guarantees of spending your life together happily, and you are never going to get either, life is about taking chances, and that is exactly what anyone does entering into a relationship

Anyone of any age could see you as a meal ticket, anyone of any age could get bored of you, as you could them, at anytime, it is not age restricted or have deadlines, if it does I am fucked in two years

.
Asia is not the answer either, I know people who have taken that road, only one has worked out, because he moved there, bringing a dial a bride miles from home and family has more complications than you will ever take into consideration, and again, comes with no guarantees.
You are posting from a miserable place in a poor state of mind, with ideas that you have not thought through, leave the wife if things are so bad, she probably knows you play away and she does not care, where does she think you are when buried up to the nuts in the SB ?
Until you do, and spend some time working on yourself, learning perfection in humans and guarantees of happiness do not exist, you are going to torment yourself no end, and spend your life ticking boxes but never ticking every one, there is always a few crosses in those boxes.