Your last line stopped me. Feeling alone inside a marriage is a particular kind of lonely and I'm sorry you're in it.
On the question itself, yes, it does work for a lot of people. What seems to matter most is how long you've left it and whether you both want it to work rather than wanting to have tried. Most people wait years longer than they should, so you're asking sooner than plenty.
Can I gently ask you about one line though. You said it'd be a last ditch attempt to save it, or at least to say you tried. I read that a few times. They're quite different things, aren't they. I wondered which one it feels closer to when you're on your own with it.
If it helps, there's a way to test that costs nothing. Picture yourself suggesting it and him saying yes straight away, really keen. What happens in your chest? If it's relief, you probably do want to save it. If your heart sinks a bit, that's worth knowing too, and it doesn't make you a bad person. Both are completely allowed. They'd just mean quite different things to say in a first session.
The other thing I noticed, and do tell me if I've read it wrong, is how careful you've been. Resentment on both sides, love on both parts. You've been very fair to him in a post where you're telling strangers you're unhappy. I don't mean that as a criticism, it sounds like you're just a fair person. I only wonder whether being that fair for ten years has made it hard for anyone to see how bad it's got, yourself included.
If you do go, you don't need to arrive with a tidy summary. "Honestly, I don't know if I'm here to fix this or to be able to say I tried" is a perfectly good way to start, and a decent counsellor will have plenty to work with in that. Better than the two of you being reasonable at each other for ten weeks.
And for what it's worth, counselling can be a good place to separate kindly too, if that's where it ends up. That isn't the same as it failing. People seem to think of it as pass or fail and it really isn't.
Whatever you decide, the alone part matters. Don't leave that to the end when you talk to someone.