I just thought of something.
In Unity, Chakotay was hooked up to a mini-collective, he has personal, first-hand experience of what it's like to be part of a collective and so he would be slightly more able to understand and appreciate what Seven's life had been like as a Borg.
This could have potentially tipped the balance in his favor as Seven regarding him as a compatible and suitable life companion.
It's the only thing I can think of that would explain the logic behind such a seemingly mis-matched couple.
(If anyone else had raised this point that in the previous 21 pages of thread, sorry for not reading that far back.

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Peyote.
Chakotay ritualistically and religiously uses technology to replicate the shared experience on the "astralplane" previously said to have been created by shamans with their semi-legal desert crack, that is if telepathy/communing had not been impossible in the given universe of our story, rather than psychedelic drugs making people imaginative and giggly like the previous generations of practitioners of his faith had done, that in actuality them all "getting baked" was something more akin to kicking these native Americans up the evolutionary ladder momentarily, not that we have any poof one way or the other considering their "gods" were probably left over stories about visitations from the Preservers hearding people away from meteor strikes, but this 24th Century Indian's forefathers had got by by getting wasted and then babbling about being "one conciousness" with their skyfathers and "animal spirit guides", which just wasn't enough for a modern man who wanted empirical demonstrations (Worf got Khaless to appear to him just by sweating really hard. Now that's FAITH!) that spirit guides were wandering about between all their heads, meanwhile Chuckles who just said no to drugs, because drugs are bad had to one up and reup the old guard by mail ordering a backwired psychotricorder machine which creates a hive mind between a small number of people where they can rgwn use to commune in a virtually real environment for real which is what the Indians from the Ancient West never did do but bullshitted that they did do when they did claim to be invested in their religion, so really Chakotay was shitting on his faith by resetting the foundations of how his people communed since the lie of what was achieved is more real than the truth pf what really happened just like Shannon Janeway deserves a Punch in the Mouth from lying that she was an astronaut, or whosoever began the inspiration source which launched Kathy into Space.
So he was all already all about being Borg-lite, well before the "healing link" Riley used to fix him up and then still in a state of shared sensation with about 5 other free Borg, they all shared a sex act in which Riley and Chakotay were the prime movers... Well, considering where the film cut out, others might have joined in physically while sharing the effects of the experience... Wow. Chakotay would be able to feel himself inside her from her perspective, which really begs the question about no mater how many bodies were involved, considering the shared intellectuality taking note, that this could have as easily been masturbation as much as an orgy.
But with all this on tap, the sexualidiosyncraticgynmastic possibilities, it's a low down dirty shame that I don't expect nothing but one on one vanilla and missionary on a bed with the lights off and no talking from those two once they decide to get busy.
Sex might = Borg to Chakotay, but he was already a into hive minds well befor these blonde ladies tried to lead him up the garden path.
The problem is that most of you are only looking at “senior staff.” That doesn’t work for finding Seven a compatible partner any more than it works for finding Harry Kim a compatible character. They have the same problem, and that is an imbalance of experience.
Once you get past just looking at the senior staff there are lots of parings. Seven’s list could include (although not consist entirely of the following.)
Ayala (who fic writers have given the first name Michael, unless it’s M/M slash and then his first name would be Gregory. I like Michael better.)
Walter Baxter
Freddy Bristow
Mortimer Harren
William McKenzie
Kashimuro Nozawa
Lieutenant Rollins
Ensign Vorik
Pablo Baytart
Doug Bronowski
And that is just a partial listing. There could be even more if I had included Maquis or females on the list.
Brit
What a nice list of "Crewman X" you have there.
They could have used anyone and i would have been happy, even Chakotay, if they just would have shown us how the relationship built up from nothing into something like they did with Tom and B'Elanna.