Minor nit to give credit where it's due. 280 North had three founders: http://en.wikipedia.org/wiki/280_North,_Inc.
And Apple is certainly in a better position to do such ports than you were back then: They have the full source code of every framework they developed. I am not saying it is trivial or not much work but it is doable over a couple of years... don't you think? You have certainly more internal knowledge than I do.