After review from Barry & Guido, I've just merged an update to PEP 1 and the PEP index generator that separates out provisionally accepted PEPs to their own state in the PEP flow: https://github.com/python/peps/commit/307dda38d4e7a5760dd4979ae9978a4eb1e705...
To date, that status has been reported as "Accepted" both in the original PEPs and in the main PEP index, now it gets reported as Provisional in both places.
P.S. As part of this, I switched the flow diagram in PEP 1 from a PNG to an SVG, which seems to have confused python.org's image rendering: https://github.com/python/peps/issues/701
I'm already looking into it, but am open to tips from folks more familiar with the website's rendering machinery.