"especially for some legacy projects"
This is/could be the problem with the exotics..
but of course I understand you.
Greeting
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Just one tip refers to meta data:
if you want keep foreign metadata:
others then with wavpack,
flac need for both wav encode to flac & decode from flac to wav again
an additional command-line option.
"--keep-foreign-metadata"
otherwise the wav file itself would be maybe not the same as before(size)
You would simply loose all foreign meta data from wav files;
like for example loop points, descriptions, sampler info or whatever meta.