Our JIT is tightly entangled with cpythons code. This API would not be enough for us.
There are several places where we use different object layout for example (e.g. we currently don't have a
ob_refcnt field, we use hidden classes, ...).
Also we currently don't use the cpython bytecode but instead our own. So we would at least need a step which converts the the cpython bytecode into our own. I don't think this would be to hard to do it's more the problem of the different object layout.