Maybe try with cpanm --look to manually run the make steps, skipping the tests directly.

cpanm --look Inline::Python
perl Makefile.PL
gmake
gmake install
[download]

Substitute dmake for gmake as needed.

I just tried it, but don't have a python handy that satisfies Inline::Python (it's provided as part of a commercial package) so could not get it to a successful make stage without more work or installing another python on my system.