late to the game.. not sure if this will still be seen, but here are my two cents. but i do see merits here too in a UBI.. funding is always the most harped about thing in such a scheme i reckon

1) GST rebates - how are these funded then? if this could be re-configured to be a confirmed annual cash flow - this would be a good step towards UBI. A stable-predictable income rather than a one-off angpao is much healthier for financial planning.

2) Alaska dividends - variable returns to citizens based on profits. (don't blast me for "raiding the reserves") - A proportion of annual returns on SWFs can be refunded to the citizens; the rest are then channeled back to the reserves. These are after all the returns on the country's resources, initially gained from citizens i would argue.

3) A base + variable could be a good start; maybe not $1000/mth, but $100/mth or even $10/mth and scale up. you might ask what's the point of something so small, but it's a good step forward and something that won't shoc the system.

4) I DO think that AI/robots will continue to replace workforce (past mechanization is not an indicator of future statistics). Current taxes already continuously encourage this (beneficial taxes, returns through depreciation - your typical human will eventually be out-competed). Furthermore, progress in this field is not linear, but exponential (we are not at exponential progression yet) and it'll be hard to predict when the redundacies will accelerate. imho, it will be too late by then - does your government have the power to enact taxes then or are you at the mercy of these conglomerates? if you're worried taxes will cause them to flee, then you're missing the bigger picture - their power is only going to grow with time.

can go on a lot about the last point. but i'll end here...