Maybe a simpler way to do it is to start a BMW Tool Swap FB Page where people can buy and sell BMW special tools. It would make finding the tools easier than searching on CL or marketplace or forums. I know i wasted a bunch of time searching for a used camshaft timing set for my E83 w/N52 engine. I eventually got a name-brand set on Ebay, but it was hard to find. I know people have those kits sitting on shelves in their garages (just like I do now). If there was a reasonably active swap page on FB, perhaps people would be more inclined to list the stuff they have.

AM.

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E70 2010 3.0 M57 AT Titanium Silver with Black Leather
E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)