
Actually, knowing that the Miqo'te are in Eorzea since long now and thus have been bathed in the other races' cultures, monogamy might not even look weird to them. The polygamous aspect of the Miqo'te's life is only a matter of survival, not of feeling.
Now there are many situations which seems completely legit to me for a miqo'te to be monogamous and only one which is completely impossible popping in my mind : If he's a Nunh as breeding for the Tribe's survival is part of the Nunh's duty. Thus, I believe that for a Tia or a Keeper (Keepers lifestyle allowing a male to settle with one female easily) it would actually not be that surprising at all.
The only question might be regarding the wedding tradition. I don't think there is such a thing between miqo'te, maybe some ceremonies around breeding and fertility to increase the chances of birthing a male, but nothing looking like a bonding. While having your miqo'te being monogamous seems to be completely normal and legit to me, maybe people would be surprised more by the actual bonding than anything else.
Now there are many situations which seems completely legit to me for a miqo'te to be monogamous and only one which is completely impossible popping in my mind : If he's a Nunh as breeding for the Tribe's survival is part of the Nunh's duty. Thus, I believe that for a Tia or a Keeper (Keepers lifestyle allowing a male to settle with one female easily) it would actually not be that surprising at all.
The only question might be regarding the wedding tradition. I don't think there is such a thing between miqo'te, maybe some ceremonies around breeding and fertility to increase the chances of birthing a male, but nothing looking like a bonding. While having your miqo'te being monogamous seems to be completely normal and legit to me, maybe people would be surprised more by the actual bonding than anything else.