He would be the absolute easiest element of the Rebirth run to bring back without delving into "oh yeah, I was 10 years old a couple months ago" territory. But, personally, I don't see Boyzarro fitting into Taylor's aims with his run. Even the Hamilton alien refugees fit better with those themes (though, again, they have the issue of delving into "I grew up 7 years in 3 weeks" territory).