There is very little space to get a spring compressor in there so I think about the only tool that might work (with extra pieces) would be the Schwaben one that works from the outside. I ended up using plumbing strapping to hold the spring compressed, either using the weight of the vehicle to compress the spring or if the spring is out, using a conventional spring compressor or strut compressor to compress the spring and then strapping it with 3 or 4 straps of the plumber's strap. Not as sketchy really as it sounds but not totally safe either.

Now that I think of it the Schwaben one might not work anyway because there might not be enough of the spring exposed.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)