Perhaps an illuminating exercise to collate all SKSE functions which do not match combinations of what is presented by vanilla to verify Arthmoor's assertion.
The XXSE is quite a sophisticated decompiler and is sure to be used for the next Bethesda release not due until at least 2020, so there is no urgency. However the conversion is nothing more than a tedious one, so it will get done by someone eventually.
Oracle provide a nice precis on data types.
The best idea is to fire up Oldrim and see how the build works in action with VS. This is going to take some time, after which we can tinker with the intricacies of SE.
GitHub is set up so one can post in a fork, and if stuff works then, well, hey, great. If someone has already got a working build, we still have benefited because we have learnt something. If not then the task is to harness git to perform diffs on any non-functional stuff e.g. Yamashi's and use any components which are working. Thus no work is wasted.
However in my hands there is no fork until mid next year at the earliest. Let's hope someone else gets there before!