I've not done the conversion you outlined, but I do know the G32 and the G19 use the exact same factory trigger, so if your aftermarket trigger works in one, it should work in the other (check with the manufacturer to be sure).
Based on the above, if the exact same factory trigger is used in the G32 and G19, then I don't see how the ejector could possibly interfere with the trigger operation, or the opposite. I do know that some folks have experienced stoppages and other problems when using the conversion barrels, even in otherwise unmodified Glocks, so I would recommend using the stock trigger for testing the conversion barrel. That way, if you have any functioning problems, you won't be wondering if it is the barrel, or the trigger/barrel combination causing the difficulties.
Fairly general advice, I know, but I hope you find it helpful.
"Placement is power" -- seen in an article by Stephen A. Camp
(RIP, Mr. Camp; you will be remembered, and missed)