A second crossover between DC and Bonelli has, in fact, already been announced, creative team included: 2020 will see the first meeting between the Fastest Man Alive and the Protector of Darkwood,
Zagor!
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It might look like a random match, but Zagor is actually a close equivalent to the Flash since it's the one more directly connected to the concept of multiverse. Despite being a pastiche of Robin Hood, Tarzan and John Brown, Zagor has gone through dozens of adventures where the curtain dividing his world (there's no common Bonelli-verse in a strict sense, but let's pretend there is) and parallel dimensions suddenly got a lot thinner than usual.
By the way, here is the complete roster of Bonelli characters (sorry for the small image):
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There's potential for A LOT of crossovers!