I'd also nil `native-comp-jit-compilation' in the early init.

After that one should still be able to run the native compiler testsuite
with say:

./src/emacs -batch -l ert -l test/src/comp-tests.el -f ert-run-tests-batch-and-exit

We want probably start running first all tests but the bootstrap one and
if they pass run this as well.  At this point probably start reasoning
depending on the output.

Best Regards

  Andrea