If you make a change like this though, I think a lot of other adjustments logically follow.Yes, that's the tricky part.
I seem to be politically moderate on this issue, in that I am in favour of some form of social security safety net for the essentials, but I also think any government aid beyond that needs to be limited so those who do more also see more benefit in return. A guaranteed basic income seems like an interesting idea that could work as part of a wider reform of our social security framework.
Perhaps it could be combined with some form of public service requirement for those who want to claim it, so it would be more like a guaranteed job available to as many people as need it than a hand-out. This could be used to support useful activities that aren't run commercially, such as looking after local neighbourhood amenities, or helping at your kid's school if you have useful skills to share, or even going abroad to help with aid work after a natural disaster. Instead of the state social security apparatus concentrating on who qualifies or doesn't qualify for which benefits, with sometimes controversial or unfair results, maybe it could concentrate on recognising valuable activities and helping those otherwise without a job to contribute to them.
Next you have the issue of private and public sector employment. Maybe set a statutory minimum wage for employing someone full-time that is a modest but noticeable amount above the basic income level? Tax any form of income above that level, adjust in some reasonable way for people who are working part-time, and adjust in reasonable ways to support those who have other genuine responsibilities or disabilities, and this seems like the basis for a system where work does pay but if you're ever the unlucky one for a while then you aren't getting punched when you're down. Maybe it could even support a different kind of lifestyle for the type of person who likes contributing to their community in practical ways and doesn't much value material things or financial wealth.
I also wonder whether, given the shifting population patterns and increasing debt particularly among the young that we have in the West today, we should place a lot more emphasis on social housing, even if that just means a modest dorm-style room and some basic communal facilities so everyone can have somewhere to eat, sleep and wash. It seems to me that this would be a natural fit with the idea of giving everyone a basic safety net and an opportunity to move up to enjoy things beyond the essentials in exchange for taking on better paid work.