The more I look at this "simple" problem, the more I hate it.
Now i'm thinking to use the condensate pump to pipe up to the garage attic, then outside to the garage gutter. Due to the floor plan, there really isn't a great way to bring the condensate out of the garage near ground level.
My gutters have buried lines, which drain to a slope.
Then I can cap off the line in the crawlspace.
It's hard to understand your drainage "layout" issue MurphyMan minus some drawings. Piping it into the attic and then out to a rooftop gutter is hard to envision and a real round-about way of doing this. So it would seem.
Why can't you just remove the condensate line from the sewer line and then continue it to outdoors via the crawlspace area?