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I wish I'd taken some photos...
The 135i bumper hangs down lower than the 128i bumper so I think you'd have a gap. It's possible the 128i undertray *might* get in the way of the bumper - I haven't seen a 128i undertray to say for sure. I think if you had to trim anything, it'd be the undertray not the bumper.
I think you're correct on the brake ducts - I took them out completely when I put the 128i bumper on. Although it was just one bolt per side and they clip into the hole in the fender liner. You'd definitely want to figure something out there otherwise there's nothing shielding the underneath of the headlights, horn etc. from the weather.
The outer mounting holes in the undertray side pieces lined up fine, but the middle section (main plastic undertray) is different.
To do it as the factory did, I think you'd probably need a new undertray, brake ducts, and if you're going with 135i brake duct grilles, you'd probably want the oil cooler duct and blockoff piece for the other side too. (If going with 128i M sport fog lights, you won't need the oil cooler duct and blockoff piece)
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