It appears that if I install some of the modules that mis-behave (Mac for testing - PSUtil needs compiling) under 'proper' Python where compilation is avialable then (hopefully) the resultant directories in site-packages may be installed via one of the index options (extra-index-url?)
I'm going to have a little play with this to see what happens.
Looking at this... https://packaging.python.org/en/latest/guides/hosting-your-own-index/
It appears that if I install some of the modules that mis-behave (Mac for testing - PSUtil needs compiling) under 'proper' Python where compilation is avialable then (hopefully) the resultant directories in site-packages may be installed via one of the index options (extra-index-url?)
I'm going to have a little play with this to see what happens.
Any pointers / suggestions / requests?