Thanks to both of you.
I'm a Methodist and our forebear was an Anglican priest. His conservatism would have had him reject today's Canterbury, but I don't think he'd have gone with Rome. But it's a different era now. Who knows?
I, too, was a Methodist until the 1980's. After an intermediate stop with the Evangelicals (of the Dallas Theological Seminary & C.I. Scofield, variety), the Holy Ghost dragged me to Rome in 1989. I found the Anglican Usage a few years later, and can gladly say it is really home for me.
As some may know, when the Pastoral Provision was first issued in the early 1980's (at the urging of a number of Episcopalian clergy, and coming in the wake of the ECUSA's ordination of women, and BCP revision, in the late 1970's), it was cautiously worded to suggest, at least, that it was for ex-Anglicans only. Since any Catholic can satisfy his or her Sunday and holy day obligations at liturgy in any Catholic rite, there were always other Catholics coming to liturgy at the AU parishes (which are "personal parishes" canonically), and it rather soon developed that these folks aggregated themslves to the parishes on a permanent basis (as I did). This now is understood and at least acquiesced in by the local ordinaries. It only makes sense, really, as a pastoral adjustment for the good of the faithful, and the bishops in the major cities, anyway (Houston, San Antonio and Arlington, TX) come to the AU parishes for blessings, confirmations, consecrations of new buildings, etc. knowing what is going on.
All that said, every now and then there is some remark from some apparently ill-informed clerical source to the effect that the AU parishes are only for ex-Anglicans. So when I hear that (once every other year or so), I revert back to exactly what you were saying: as a former Methodist, my founder was an Anglican priest, and even if Methodism later became separated from the C of E (perhaps due to Calvinistic influences?), I should "qualify" for the AU as a former quasi-Anglican.
Somehow I don't worry too much about these kinds of restrictive readings of the Pastoral provision now, however, especially when I see our own (duly approved) liturgy book, the Book of Divine Worship, on prominent display at such bastions of Catholic conservatism as the "Ancora" bookstore in Rome, outside of St Peter's (where Card. Ratzinger used to shop), and the Catholic Information Center in Washington, DC.