2. Using monetary policy--instead of, or in addition to, fiscal policy and/or income-producing public assets--to fund UBI and/or universal capital ownership investment accounts for all citizens (e.g. Helicopter money and Capital Homesteading);

3. Baby bonds and/or stakeholder accounts (which could be considered a form of basic income, but restricted to lump sum allocations or investments at one or more stages of each citizens life, rather than regular monthly payments);

4. Some of Marshall Brain's more whimsical ideas, e.g. funding UBI by selling advertising on currency;

5. Economist Robert Schiller has proposed both public and private versions of "livelihood" insurance, which would compensate those who lose a job and cannot find another that offers equal or better pay.  A publicly-funded version of this could act as at least a supplement--or perhaps as a transition--to UBI, since it also is not truly "unconditional."