There obviously is no complete replacement but a greens drink would be the best substitute. Greens+ is the top brand but a bit pricier. Now foods also makes a good one that is cheaper.
For people that don't like veggies the best thing to do is cook them into things. Like if you are making an omlete throw a handfull of frozen spinach in it. You can barely taste it.
Also should note that if you are using a greens drink a multi probably isn't needed at all.