I couldn't begin to imagine the kind of uproar that kind of release pattern would cause on the forum. Theres enough problems now with panic about the new method that people don't like let alone complicate the whole thing by running two releases of the same version as you suggest.
If you're on a release that you find stable, in this case H and you upgrade to I and don't like it you can roll back to H and pick it up again when J comes out. The last released version will always have all the updates and fixes accumulated along the way.
I'm more prone to try and sell it to the forum in general how Noël suggests.