My objective is not to convert her, but simply for her to acknowledge that there is another, very interesting way of seeing life and the universe

Well, from your wife's perspective, the end of that sentence probably is viewed more like...

very interesting way of seeing life and "MY" universe

She is experiencing her very own version of the universe (which is within her) while at the same time you are trying to explain your own unique version of the universe (which is within you) and that automatically causes a disconnect. Those two vibrational frequencies of how the world, the universe, or life in general are supposed to be are not a match, which then causes a clash of belief systems.

In my mind, almost everything makes sense, but can't possibly sustain a debate with her negative, hopeless view of life.

Here is an example of a belief system clashing. Your belief is that she has a negative hopeless view of life, but maybe in her reality, it isn't negative or hopeless at all. Maybe her beliefs about life are helpful and productive and make her the human being that she is.

Debating about what life and existence is as a whole in my opinion is pointless and futile in all regards. I see it as sharing opinions and allowing the other persons point of view be an equal of mine. It doesn't mean you have to agree on the opinion of another. It can be as simple as agreeing to disagree and letting it go from there.

When I tell her that at the end of the day it's only love that matters, she brushes it off, and starts asking why then there is so much suffering, and my explanation becomes too esoteric and I lose her.

Unless "she decides" to change her beliefs about life, you will continue to lose her in any conversation that you have.

In my early stages of studying reality creation/LOA, I tried to explain things like this to certain people in my life thinking I could be of help to them. After a few attempts and constant brick walls being put up (belief clashing) I finally realized that it isn't my place to change somebody else or try to open them up to new ideas. Everyone is on their own journey, and their unique journey is none of my business.

Now if someone comes asking questions similar to what we do here at IQ, then that is the time when our opinion can be shared with the possibility of the questioner being open to the answer that feels right to them. When a question is actually asked, there is an inner desire to understand an answer instead of two opposing ideas coming together in a resistant fashion.

So, taking for granted that she'll never read a book on the subject, do you have any suggestions on how I can explain to her these concepts in a concise way?

I personally don't see a way you can explain these ideas without your beliefs clashing. You could always suggest her taking a look at a site like this one. If she says no thanks then just simply allow her that choice and allow her to have her own opinion if she would decide to explore a site like this.

If you want to get absolutely nutty and crazy, you could shift to a parallel reality version of earth where your wife and you have similar points of view just by understanding that you are 100% responsible for everything that shows up in your reality.