I've been using a 135i N54 shift lever on my car for several years now with no issues, it shortened the throw a good bit from the stock 128i lever.
What parts come with the short shift kit you're considering?
The main difference I can think of is that the shift selector rod for the 128 has a bend in it where the 135i doesn't. But your kit may not include that part, some kits do and some don't.
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11 128i slicktop
13 WK2
19 Alltrack S
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