I am pretty certain that it takes only slight twisting of existing myths to reenact these events.
If you are looking for a more peaceful union, look at the Choralinthor myth, where a sea god and a land goddess propagate.
There are two places predestined for unions between humans and triolini - Seapolis and the City of Wonders, where there is magic allowing them to enter the realm of the others.
There might even be someone questing for such a union to happen - an entire race of Cetoi mermen was eradicated in the Battle of Tanien's Victory, the Hreekeen. Finding the right air deity and a suitable niiad might be a way to return this race to Glorantha?
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