Larian would have to rewrite Halsin, then he would be like the others and that would be bad. The game is finished and he was introduced like this. Sorry, but Larian apparently cares about minorities, what would it look like if they flipped the only poly? He needs some improvement, but he shouldn't become like the others.
The best way is when he says or shows in Act 1 or 2 that he might kiss someone or so.
And at the end we can go with him, that would be nice. That would be a good improvement without breaking it.