I love the "consumeriat" term. But I have an idea that supports funding UBI while discouraging "nonsense purchases."
I'd much prefer a VAT, like Yang described. Property taxes are already enormous in places like California. Also, we want to encourage home ownership, rather than making it more expensive. If everyone owns property outright, however modest, $1,000 per month UBI can better support a dignified life, rather than just going to landlords.
A VAT would tax the rich in a way they couldn't easily avoid, and it would make poor people think harder about buying things they don't need on credit cards.
Maybe a VAT could push companies to make products worth buying.