I imagine to appease anyone with doubt to the benefits of basic income some sort of "basic work credits" type system would need to be in place for anyone without a normal job to contribute something noteworthy back to society.
The matter of what is acceptable as "basic work" may already be in place as court ordered community services, peace corps, or local public works projects. Maybe even a new variation of non-profit organization [1] that has specific structural rules for "basic work" credits?
It's a noble attempt at compromise, but at that point, you're not talking about UBI anymore. The entire point of UBI is a rejection of the notion that a person must contribute before they have permission to live. It's a statement that the right to life is inherent to every individual, details on the morality of suicide or abortion aside, and that if we can't simply provide those necessities, then we can at least provide the means to get them through guaranteed income.
Basic Income is, by itself, already a compromise. To compromise again is to no longer be a separate concept.
At the point you're talking about, it's not actually different from the situation as it stands now: what you're really saying is that the minimum wage needs to be sufficient for living expenses. Nothing more.
The matter of what is acceptable as "basic work" may already be in place as court ordered community services, peace corps, or local public works projects. Maybe even a new variation of non-profit organization [1] that has specific structural rules for "basic work" credits?
[1] http://en.wikipedia.org/wiki/501%28c%29_organization