I haven't done it, in fact I just learned that my 2 E53's have a variable displacement AC compressor from your post. I now see the problems that often come with it. However, I have read up on it, and it seems the variable displacement is purely mechanical, not electrical, so it seems replacing it with a fixed displacement unit like the Denso is straightforward and won't, in theory, interfere with operation (It may be a little louder and increase fuel consumption slightly)

Here is a link that might be helpful:

https://axleaddict.com/auto-repair/vdcadjustorconvert

In addition to endorsing the installation of a replacement fixed displacement compressor, this article demonstrates how to adjust the variable displacement (vd) valve and how to convert a variable displacement compressor to fixed displacement by modifying the vd valve if the valve is accessible.

EDIT: We should probably figure out whether the E53 Variable displacement compressor is externally or Internally controlled. It seems to me that the internally controlled unit would be more easily swapped for a fixed displacement compressor.

You will do us all a favor if you document your results from switching. You can always switch it back.