I'd be OK with vouchers usable *within* the public system, and then a huge variety of public sector options, including some funded by the Feds in far away eco-villages, hard to get into. A voucher might not be enough to get you in.
Choice *within* the public system is a real possibility. Like many here, I'd *love* to compete, and pester the Feds to let me help the USA establish more interesting alternatives, leading to attractive lifestyle options for teachers as well (e.g. as bizmo-based gnu math teachers).
I also pester the various tribal sovereignties, as I know they deserve better as well.
It's not that I'm comfortable with the status quo and want to inhibit freedom of choice. I'm all for creating more choices.
But if the USA is supposed to pay for it somehow, then the resulting charters must reflect the USA's values and assist in their propagation, down to the pedagogical level. I don't pretend I'm the only one with ideas about what this might look like. But at least I have some ideas and am willing to share them publicly and openly.