Where the money comes from is kind of irrelevent in terms of monetarist economics. Governments can factor money at any time for any reason (like WW2). It can do the same for UBI.

UBI dollars will tend to stay in local economies, thus increasing job prospects for low-wage workers.

I've been a fan of UBI for 45 years. When I first heard about it, it was called "negative welfare."

And I believe we should intruduce UBI slowly, starting at $200 a month. Watch how the economy changes, then add another $100.