Theoretically every leaf is at a node point where a new shoot could grow.
So you could possibly take a small sliver of the stem bark, including that node with a variegated leaf, without seriously damaging the rest of the plant. Then insert that into a rootstock using a T-bud method.
Trouble is that everything is so small and difficult to do with a finger lime. And in practice, some leaf nodes are blind or take for ever to start growing.
I don't know whether additional light on a stem will make any difference to making a new shoot start to grow. Any opinions on this?