I would say yes, Americolor do an electric green gel, I would try that on a small bit of SMBC, The yellowness of the natural SMBC should actually be an advantage for this I think, I imagine it will dull the 'electric' part of electric green just enough to give a good lime.
air brush or edible spray paint -- usually swiss can't hold vibrant/deep color -- but some of the morphed formulas that add some confectioner's sugar or a little american buttercream -- but i know air brush/edible spray bpaint would work
I use "electric" gel colors which come in a four pack, made by Betty Crocker and sold in grocery stores. The green tends toward a lime green all by itself, but if needed, just add a little of the yellow. I love these colors!
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