I think many people working on Basic Income would do well to focus their energy on pushing Single Payer + voucher systems for everything. Basic levels of healthcare, food, etc.

It makes far more sense than single payer, because it cannot be traded away easily by the recipients during bad decisions, so it is a stronger safety net.

But it is also far cheaper and more efficient than basic income, because buyers don't compete so prices don't go up across the board "patio style".